Quick Answer
P2146 means Fuel Injector Group “A” Supply Voltage Circuit/Open. The controller detected an electrical fault in the OEM-defined shared supply path for injector Group A. It does not identify a universal injector group or prove that an injector or ECM has failed. Save all code data, then identify the exact VIN circuit before testing.
1What Does the P2146 Code Mean?
The P2146 code is the standardized powertrain DTC for “Fuel Injector Group ‘A’ Supply Voltage Circuit/Open.” The engine controller, or a separate injector-control module on some vehicles, determined that the high-side supply serving an OEM-defined injector group did not behave as expected during the monitor.
“Group A” is a circuit label, not a universal bank, cylinder list, or physical side of the engine. The wiring diagram for the exact VIN identifies which injectors share that supply, which module drives it, and whether a fuse, relay, splice, resistor, or separate driver module is involved.
The word “open” describes the monitored electrical result. It can come from loss of feed, an open wire, poor terminal contact, a disconnected load, protected driver shutdown, or an internal power-stage fault. It does not say that fuel pressure is low, that an injector is clogged, or that every injector in the group needs replacement.
P2146 versus nearby injector codes
| Code | General description | Key distinction |
|---|---|---|
| P2146 | Fuel Injector Group A Supply Voltage Circuit/Open | Shared supply or high-side path for the OEM-defined Group A. |
| P2147 | Fuel Injector Group A Supply Voltage Circuit Low | Electrical low classification, not the open-circuit label. |
| P2148 | Fuel Injector Group A Supply Voltage Circuit High | Electrical high classification for the same named group. |
| P2149 | Fuel Injector Group B Supply Voltage Circuit/Open | Equivalent fault family for a different OEM-defined group. |
| P0200 | Injector Circuit/Open | General injector-circuit fault without the Group A supply wording. |
| P062D | Fuel Injector Driver Circuit Performance, Bank 1 | Driver performance code; not the same as a shared supply open. |
OEM example, not a universal threshold: Volkswagen’s 2014 Touareg reference describes some P2146 implementations as a failed diagnostic signal from the power stage, while other listed engines use current-based criteria. This variation is why the VIN-specific procedure controls the test.
2P2146 Symptoms and Likely Causes
P2146 can disable several injectors that share one feed, so symptoms may be more severe than a single-cylinder circuit fault. The controller may also protect its driver by limiting or stopping injection. Code status and companion injector, misfire, voltage, or communication faults help show whether the event is current, intermittent, or shared.
A steady MIL may be the only symptom when the fault was brief or is stored as history.
One or more cylinders may lose injection while the Group A supply fault is active.
The engine may enter a protective mode, hesitate, stall, or restart poorly.
A shared supply or injector-control-module fault can prevent the affected injectors from operating.
Practical cause-checking order
- Recent service or a loose connection: an injector connector, module plug, ground, harness clip, or fuse-box connection was disturbed and not fully secured.
- Fuse, relay, shared feed, or ground fault: loss of power or ground can affect the whole injector group. Find the overload or poor contact before replacing a fuse or relay.
- Harness or terminal damage: heat, vibration, oil, water, corrosion, chafing, backed-out terminals, poor tension, or a broken conductor can open the supply path.
- Injector electrical load fault: a proven internal open or short can alter the shared circuit or trigger driver protection, but mechanical clogging alone does not explain the electrical code.
- Separate injector-control module problem: where fitted, failed feeds, grounds, internal power stages, or communication faults can interrupt group supply.
- ECM/PCM driver or calibration issue: consider this only after external power, grounds, wiring, terminals, and loads pass the OEM tests and applicable bulletins are checked.
After recent work, inspect before buying parts. A trapped loom, swapped connector, loose lock, bent terminal, missing ground, or incorrectly routed harness can set P2146 immediately after injector, valve-cover, intake, battery, or module service.
3How Serious Is P2146, and Can You Drive?
A current P2146 deserves prompt diagnosis because a shared injector supply can remove fuel from multiple cylinders. If the MIL is steady, the engine is smooth, no safety warning is present, and the owner’s manual permits it, the shortest light-load trip to a safe diagnostic location may be reasonable. There is no universal safe distance.
Stop and arrange a tow for a flashing MIL, severe shaking, repeated stalling, unsafe power loss, a no-start in traffic, smoke, a burning smell, visible fuel, raw-fuel odor, wiring heat, abnormal knocking, or an oil-pressure, charging, or temperature warning.
Direct-injection and diesel systems can retain dangerous fuel pressure after shutdown, and some injector drivers use high voltage or shaped current. Do not touch a suspected leak, probe an unknown driver with a generic test light, jump a circuit to power or ground, or work near moving belts and automatic fans without the correct procedure.
4How to Diagnose P2146 in the Right Order
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Save every code and the failure record
Before clearing anything, scan all modules and record current, pending, history, and permanent status. Save freeze frame, failure order, module voltage, engine state, misfire data, and all P0200-series, supply-voltage, injector-module, network, or power-relay companion codes. Several group codes together make a shared feed or module issue more likely.
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Identify the exact VIN architecture
Use current OEM information to map Group A, injector type, high-side supply, low-side control, splices, fuses, relays, grounds, and the responsible module. Confirm connector views, terminal designations, test states, known bulletins, and whether the module protects or disables its driver after detecting an overload.
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Inspect the cool, powered-down system
Make the fuel and electrical systems safe, then inspect connectors, locks, seals, pins, loom routing, heat shields, grounds, fuse contacts, and recent repair areas. Look for oil or water intrusion, rubbed insulation, rodent damage, stretched wires, loose terminals, melted plastic, and any harness trapped under a cover or bracket.
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Prove the supply, ground, and load paths
Follow the OEM isolation sequence with the specified meter, scope, current clamp, breakout lead, or approved load. Test feeds and grounds under the correct state, measure voltage drop where directed, and check continuity only on a safely isolated circuit. Never substitute another engine’s resistance, current, voltage, or pinout.
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Compare supported command and feedback data
When the VIN and ECU expose them, compare injector command/status, driver state, module voltage, misfire counters, contribution data, and supported cutout or active-test response. A command that produces no response narrows the search, but scan data does not physically prove voltage, current, terminal tension, injector resistance, compression, or fuel pressure.
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Confirm the failed branch and required setup
Prove whether the fault follows an injector load, remains in the harness, originates in a shared feed, or appears only at the driver after every external path passes. Replace a controller last. Confirm whether injector coding, module programming, security setup, or another relearn is required, then plan the post-repair monitor verification.
Specifications are vehicle-specific. Do not publish or apply a universal injector resistance, driver voltage, current waveform, fuse rating, timer, or drive cycle. PWM and high-energy injector circuits can mislead a basic meter and can be damaged by the wrong probe or jumper.
5P2146 Repairs and Typical Costs
The correct repair restores the branch proven faulty during testing. Possible outcomes include securing or replacing terminals, repairing and rerouting a harness, correcting a fuse/relay/feed/ground problem, replacing a failed injector electrical load, repairing a separate injector-control module circuit, or replacing and programming a controller only after its external circuit passes.
| Possible path | Current US estimate |
|---|---|
| Check Engine Light Diagnosis & Testing | $122–$233 |
| Connector, local harness, fuse, relay, or shared-feed repair | VIN-specific quote |
| Fuel Injector Replacement, only after electrical failure is proven | $764–$949 |
| Separate injector-control module repair or replacement, if equipped | VIN-specific quote |
| Powertrain Control Module Replacement, after external paths pass | $1,126–$1,196 |
RepairPal lists all three national estimates above as last updated August 7, 2026. They exclude taxes, fees, location effects, related work, difficult access, programming, and vehicle-specific parts. The rows are alternative outcomes, not amounts to add together. P2146 alone does not justify injector or controller replacement.
6Using iCarsoft CR Eagle P for P2146
On a supported vehicle, iCarsoft CR Eagle P can scan the engine and related injector-control module, preserve P2146 status and available freeze frame, display ECU-provided live data, review misfire or contribution information, and save a diagnostic report. Exact module access, PIDs, cutout tests, active tests, coding, and relearns depend on the VIN, ECU, software, and regional coverage.
Evidence-first injector circuit diagnosis
iCarsoft CR Eagle P
Save the complete scan, graph supported engine data, and use available active tests while checking the shared supply circuit with the required physical instruments.
Check current CR Eagle P price and availabilityCheck CR Eagle P compatibility by VINWhere the exact application offers an injector cutout, driver test, or coding function, use it only under the OEM safety and enable conditions. A missing menu or unsupported PID is a coverage result, not evidence that the vehicle component is defective. Confirm the required function by VIN before purchase.
Know the measurement boundary. CR Eagle P does not directly measure circuit voltage, current, resistance, voltage drop, terminal tension, fuel pressure, leakage, injector flow, compression, or internal driver condition. Use the VIN wiring diagram and the specified meter, scope, current clamp, pressure equipment, and physical inspection alongside scan evidence.
7Verify the P2146 Repair
Save post-repair evidence before closing the job. Confirm that connectors are locked, terminals are retained, repaired wiring follows the specified route, grounds are tight, heat shields and clips are restored, and no fuel leak is present. Complete injector coding, module setup, or relearn only when the OEM procedure requires it.
After the original records are saved, clear erasable DTCs with the approved procedure. Reproduce the relevant operating conditions safely or run the specified monitor. Confirm normal starting and running, compare supported injector command or contribution data, and rescan every involved module for current, pending, and companion faults.
One clean idle period is not proof if the monitor requires load, temperature, time, or another enable condition. If P2146 returns, compare the new freeze frame and failure order with the original record instead of clearing repeatedly. A changing symptom after a repair can indicate an intermittent terminal, heat-related loom fault, or incomplete setup.
A permanent P2146 can remain immediately after a successful repair. If the vehicle stores it as a permanent DTC, a scan tool or battery disconnect cannot erase it. Once current and pending faults are absent, the OBD system removes the permanent record only after the applicable monitor reruns and passes.
8Related Fuel Injector Circuit Code Guides
9P2146 Frequently Asked Questions
Does P2146 mean the fuel injectors are bad?
No. A failed injector electrical load is one possibility, but P2146 can also come from a fuse, relay, shared feed, ground, connector, terminal, harness, separate injector-control module, or ECM/PCM driver. The code identifies a monitored Group A supply fault, not the failed part.
What is the difference between P2146, P2147, and P2148?
P2146 is the Group A supply voltage circuit/open code. P2147 is the electrically low classification, and P2148 is the electrically high classification. Their tests can overlap, but the VIN-specific monitor and wiring diagram determine what each result means on that vehicle.
Which injectors belong to Group A?
There is no universal cylinder list. Group A is assigned by the vehicle manufacturer and may represent one shared supply branch, a driver channel, or an injector subset. Use the exact VIN wiring diagram, connector views, and service information to identify it.
Can I drive with a P2146 code?
Only consider the shortest light-load trip when the MIL is steady, the engine is smooth, and no safety warning is present. Stop for a flashing MIL, severe shaking, stalling, major power loss, smoke, fuel odor or leakage, wiring heat, or any oil-pressure, charging, or temperature warning.
How much does it cost to fix P2146?
RepairPal’s August 7, 2026 national estimates are $122–$233 for Check Engine Light Diagnosis & Testing, $764–$949 for Fuel Injector Replacement, and $1,126–$1,196 for Powertrain Control Module Replacement. Wiring, connector, relay, or separate-module work needs a VIN-specific quote.
Can iCarsoft CR Eagle P diagnose P2146?
On supported vehicles, CR Eagle P can read relevant modules, save code status and freeze frame, display available live data, and run supported active tests. It cannot physically prove voltage, current, resistance, terminal tension, fuel pressure, or injector condition, so external testing remains necessary.
Technical and cost references
- SAE J2012DA_202607, Digital Annex of Diagnostic Trouble Code Definitions and Failure Type Byte Definitions — current revision released July 29, 2026.
- 2014 Volkswagen Touareg Quick Reference Specification Book, February 2014 — NHTSA-hosted OEM P2146 descriptions and application-specific power-stage criteria.
- 2014 Audi A8/A8L/S8 Quick Reference Specification Book, September 2013 — NHTSA-hosted examples showing injector supply monitoring varies by engine and driver architecture.
- RepairPal Check Engine Light Diagnosis & Testing Cost Estimate — $122–$233; estimates last updated August 7, 2026.
- RepairPal Fuel Injector Replacement Cost Estimate — $764–$949; estimates last updated August 7, 2026.
- RepairPal Powertrain Control Module Replacement Cost Estimate — $1,126–$1,196; estimates last updated August 7, 2026.
- California Bureau of Automotive Repair On-Board Diagnostic Test Reference — permanent DTCs clear only after the OBD system verifies the repair.
Product information: Official iCarsoft CR Eagle P page.
Editorial note: This guide provides general educational information and cannot replace service information, safety procedures, test limits, or repair instructions for a specific VIN. Injector circuits may use hazardous voltage, and direct-injection fuel can remain under dangerous pressure. Confirm product coverage, OEM procedures, and local pricing before diagnosis or repair.
