By iCarsoft Official Store Technical Team, Automotive Diagnostics Editors · Updated October 14, 2026 · Technical sources checked
Quick Answer
U0132 is listed in a bounded GM DTC table as Active Leveling Control Module communication loss. The bulletin context does not make every U0132 ignorable; verify current status, vehicle and warnings.
What Does the U0132 Code Mean?
In GM bulletin 20-NA-075, U0132-00 is listed as Brake System Control Module lost communication with the Active Leveling Control Module for the 2020 Chevrolet Corvette table. The full fault record determines the test branch.
The GM source is narrower than a general DTC explanation. It is an information bulletin for a 2020 Chevrolet Corvette with no MIL illuminated, where a technician may find certain communication records stored in history. U0132-00 is one row under the Brake System Control Module and names the Active Leveling Control Module as the missing message source.
GM attributes the listed historical condition to possible software anomalies and says the entry may have no customer impact when there is no customer concern. That is a status interpretation, not evidence that the leveling controller, compressor, valve block or height sensor is healthy on every Corvette or any other vehicle.
The same bulletin draws a hard line between history and current status: a listed DTC in history with no customer concern may be ignored under that bulletin, but a currently set DTC must be diagnosed normally. Preserve the reporting module, status, MIL state and customer symptoms before using this narrow exception. The GM exception must not replace the generic endpoint interpretation.
The Autel table names Suspension Control Module A, while GM 20-NA-075 uses Active Leveling Control Module in the limited 2020 Corvette historical table. Keep those labels separated and do not infer that every U0132 vehicle has Corvette active-leveling hardware.
GM 20-NA-075 is an exception for a specific 2020 Corvette history state, not a universal definition of an intermittent leveling failure.
GM 20-NA-075 (October 2024, Version 3) covers the 2020 Chevrolet Corvette. It lists U0132-00 under the Brake System Control Module and says only historical listed records with no MIL and no customer concern may be ignored; a currently set record must be diagnosed normally.
First decide whether this is the exact 2020 Corvette bulletin condition: historical status, no MIL, and no customer concern. If any warning, ride-height change, handling complaint or current status exists, the ignore exception is unavailable. Retain the scan and diagnose the message path, supply and vehicle-specific leveling system through the normal procedure; do not convert a historical software note into a parts verdict.
Save the full module wording and suffix before clearing; they can change the test path.
Separate U0132 from adjacent fault families
| Code | General description | Key distinction |
|---|---|---|
| U0132 | Lost Communication with Active Leveling Control Module | The named message endpoint differs from the bus-off and body-module records below. |
| U0073 | Control Module Communication Bus A Off | A bus-off result is a different network condition; confirm the actual fault record. |
| U0140 | Lost Communication with Body Control Module | A body-network code is not interchangeable with this module-specific result. |
Record the complete U0132 description. The suffix, reporting module and companion faults can change the diagnostic path. Use the manufacturer's full wording and test procedure for the exact vehicle.
U0132 Symptoms and Likely Causes
Record U0132 symptoms and fault status; symptoms alone cannot identify a failed part.
Check whether companion faults share a proven cause.
Record the exact warning, when it appeared and which function changed; it is evidence, not proof of a failed controller.
Compare saved multi-module reports with supported live data; unavailable data does not identify the cause.
Preserve service history and inspect the disturbed branch first while treating timing as a clue.
Save every module's codes and status; a shared supply or network code can change the diagnostic order.
Practical cause-checking order
- Suspension-A or active-leveling endpoint unavailable on its approved supply: Use the active-leveling control module power, ground, wake and CAN path diagram to identify the required feed, ground and wake state. A missing response is a starting observation; the approved supply checks must determine whether the controller could operate in that state.
- Controller connector or vehicle network branch fault: Inspect the connector and communication branch identified for this VIN, especially any area disturbed during recent work. Document the failed terminal or wiring test instead of attributing every network record to one visible connector.
- GM Corvette history/software context misread as a live fault: Compare the fitted equipment, gateway route and current configuration with manufacturer information. A generic code label cannot show whether a route or software change is appropriate; use an applicable OEM instruction before changing either.
- Vehicle lacks the presumed active-leveling configuration: Compare the reporting receiver with direct access to the named controller. Record whether the condition is current, intermittent or stored, and repeat only the prescribed wake or verification sequence; do not use repeated battery resets as diagnosis.
- Internal controller fault only after external and status checks: Consider the named controller only after the applicable external checks support that conclusion. Save the evidence that excludes supply, connector, communication and configuration branches, and include required setup and functional verification in the proposed repair.
Did U0132 appear after recent suspension, compressor, ride-height or module work? Recheck the documented connections, parts and setup steps affected by that work. Record battery and software history; a post-repair code does not prove the new part is defective.
How Serious Is U0132, and Can You Drive?
Active-leveling and brake-system warnings can affect stability or clearance; follow the vehicle manual and stop for abnormal handling. Follow the owner manual and all vehicle warnings. U0132 does not establish a safe remaining driving distance. Stop safely and arrange qualified inspection or towing for abnormal function; do not use a successful scan as permission to bypass a warning.
Record warning messages, operating conditions and service history. Do not induce wheel slip, emergency braking or a handling event on public roads. A red stop warning or abnormal control overrides any verification plan.
Stop and arrange a tow if steering, braking, propulsion, charging, parking-brake or other safety behavior is abnormal.
Follow the vehicle-specific electrical, steering, suspension or driveline safety precautions. Do not bypass interlocks or command powered safety components outside the approved procedure.
How to Diagnose U0132 in the Right Order
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Identify the application and preserve evidence
Save the brake-system module report, U0132 status and ride-height/stability warnings.
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Inspect the relevant physical and electrical path
Confirm the VIN has the active-leveling module and identify its gateway and low-voltage prerequisites.
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Confirm architecture and prerequisites
Inspect the controller feed, ground, connector and network path before testing compressor, valves or height sensors.
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Separate network behavior from system behavior
Compare module visibility and any current companion codes from the brake, body and suspension systems.
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Prove the repair path before parts
Use the VIN-specific active-leveling procedure to separate communication, calibration and mechanical air-suspension branches.
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Verify the original condition after repair
Complete required setup and ride-height/stability verification after communication is restored.
Specifications are vehicle-specific. Use the exact VIN specifications, approved test points and required operating state. No generic value or drive cycle can replace the applicable procedure. Manufacturer examples here do not establish specifications for other applications.
U0132 Repairs and Cost Planning
A U0132 repair must address the demonstrated failure. Do not replace an assembly from the code alone.
Recheck installation and required setup after repair. The bulletin’s table identifies Brake System Control Module as reporter and Active Leveling Control Module as the missing source; this does not establish the physical cause or topology for another vehicle.
Ask the shop to name the failed branch and the measurement supporting each proposed repair.
Authorize diagnosis before parts while the cause remains uncertain.
| Possible path | Quote basis |
|---|---|
| Repair the demonstrated power, ground, connector, harness, gateway or network branch | VIN-specific quote |
| Restore configuration, software or required setup only through the VIN-specific procedure | VIN-specific quote |
| Replace the isolated controller or assembly only after external evidence and the OEM test support that path | VIN-specific quote |
These are alternative repair paths, not prices to add together. Request a VIN-specific quote separating diagnosis, parts, labor, fluids, taxes, required setup and verification. Ask which failed test supports the proposed repair and whether warranty coverage applies.
Using iCarsoft CR Pro S for U0132
On a supported vehicle, iCarsoft CR Pro S can save accessible faults, available freeze frame, live data and diagnostic reports. Preserve the U0132 evidence before clearing.
Compare the saved and final module records. Scan data supports diagnosis but does not replace the OEM reference, physical measurement or safety-system functional check.
Preserve the active-leveling control module power, ground, wake and CAN path evidence
iCarsoft CR Pro S
Review supported codes and relevant live data together. Confirm the exact VIN, controller access, PIDs and any requested active test with iCarsoft before purchase; generic product capabilities do not guarantee a U0132-specific function.
Check current CR Pro S price and availabilityCheck CR Pro S compatibility by VINThe official product page describes supported full-system diagnostics, available live data, freeze frame and diagnostic reports; exact controller coverage and active tests depend on the VIN and software. Confirm the requested function by VIN before purchase. Follow OEM prerequisites and stop for abnormal operation.
Know the measurement boundary. Scan data describes ECU-provided information; it does not directly prove the physical condition of the active-leveling control module power, ground, wake and CAN path. Where required, use approved multi-module scan access, wiring diagram, voltage-drop/continuity tools and the VIN-specific network procedure and compare reported values with the relevant measured evidence.
Verify the U0132 Repair
After repair, verify installation, clearance and required setup. Save the final findings and clear only erasable records as instructed. Battery disconnection is not a repair.
Run the manufacturer's applicable verification conditions in a safe workshop or route. Compare the original operating state with current data for the active-leveling control module power, ground, wake and CAN path, and check current and pending faults in related modules. A clean start or idle period does not prove the repair; use the OEM functional check for the affected system.
Compare the original and final fault status. Record the functional-check result and whether the original event returned.
If U0132 returns, compare its suffix, status, failure order and operating conditions with the saved baseline before replacing another part. Revisit the failed branch and inspect anything disturbed. Confirm the prescribed affected-system functional verification separately from code clearing.
Verification follows the system involved. After saving the original evidence, use the OEM procedure to clear erasable records, complete any required calibration or functional check, and compare the final module status with the original warning and fault conditions.
Related Active-Leveling Control Module Power, Ground, Wake And CAN Path Code Guides
Compare the related monitor families below. Shared symptoms or components do not make their repair procedures interchangeable.
U0132 Frequently Asked Questions
Does U0132 prove the Active Leveling Control Module is bad?
No. GM 20-NA-075 lists U0132-00 from the Brake System Control Module as Lost Communication with Active Leveling Control Module. The entry is a DTC table label, not proof of a compressor, valve block or height-sensor failure. Use the VIN-specific procedure to prove the responsible feed, connector, network branch or controller before replacing parts.
What should I check first for U0132?
Save every module's codes and freeze frame before clearing. Confirm the full definition, suffix and VIN architecture. Then inspect recent suspension, compressor, ride-height or module work, connectors and shared supplies. Those facts determine whether the next test needs approved multi-module scan access, wiring diagram, voltage-drop/continuity tools and the VIN-specific network procedure or a manufacturer-specific functional procedure.
Can I drive with the U0132 code?
Active-leveling and brake-system warnings can affect stability or clearance; follow the vehicle manual and stop for abnormal handling. Follow the owner manual and all vehicle warnings. U0132 does not establish a safe remaining driving distance. Stop safely and arrange qualified inspection or towing for abnormal function; do not use a successful scan as permission to bypass a warning.
Why did U0132 return after a part was replaced?
Compare the new record with the original suffix, reporting module and operating state. A replacement may leave an external message-path fault, installation issue or required setup unresolved. Reopen the failed diagnostic branch instead of treating the returning code as proof that the new part is defective.
What should a U0132 repair estimate include?
Ask for the failed-test evidence and a VIN-specific breakdown of diagnosis, parts, labor, taxes, required setup and verification. A code alone cannot establish the repair price.
Can CR Pro S diagnose and clear U0132?
On a supported vehicle, CR Pro S can organize available faults, freeze frame, live data and reports, and can clear erasable records after repair. Confirm exact ECU coverage. It cannot replace the OEM functional procedure or physical measurements for the active-leveling control module power, ground, wake and CAN path.
The iCarsoft Official Store Technical Team maintains the store's fault-code library. This guide organizes published technical references and verified product information; it does not document a hands-on test of a particular vehicle or claim an individual engineer's review.
Technical and cost references
- GM 20-NA-075 — U0132 active-leveling communication entry. Primary-source terminology and bounded mechanism evidence; not a universal repair criterion.
- Subaru Electrical Systems Operation & Diagnosis Module 602. OEM training context for no-message communication faults; it does not set another vehicle’s topology or thresholds.
Product information: Official iCarsoft CR Pro S page.
Editorial note: General diagnostic education, not a substitute for the owner's manual, current VIN-specific service information or professional inspection. Test limits, procedures, coverage and costs vary. Related articles provide context; apply only the specifications and repair procedures that match the vehicle. No universal failure rate, repair price or outcome is implied.
