Quick answer
Code P2068 is “Fuel Level Sensor ‘B’ Circuit High.” The PCM or instrument cluster has detected that the signal voltage from the secondary fuel level sender — sensor “B,” used on vehicles with two senders or a saddle-shaped tank — is higher than expected. The usual culprits are a faulty sender, a signal wire shorted to power, or an open/high-resistance ground.
The P2068 trouble code points to a high-voltage fault in the secondary fuel level sender (“B”) circuit, which feeds your fuel gauge. This guide covers the symptoms, causes and fixes for P2068, and shows where live data on a scan tool like the iCarsoft CR Max P reads both senders to localize the fault.
1What Does the P2068 Code Mean?
P2068 is a generic powertrain DTC set when the module sees the signal from fuel level sensor “B” higher than its expected range (typically above about 5 volts) for a calibrated time. Sensor “B” is the second / auxiliary sender, used on vehicles with two senders — often saddle or dual-section tanks. A high reading usually means a short to power or an open ground rather than a low-fuel condition.
2Symptoms of the P2068 Code
- Check engine light / MIL on.
- Inaccurate fuel gauge reading.
- Fuel gauge stuck on full or empty, or fluctuating.
- Low-fuel warning behaving erratically (or not at all).
- Possible “check fuel level sensor” message.
- Risk of running out of fuel without warning.
- On dual-tank systems, fuel imbalance between sections.
3Common Causes of the P2068 Code
- Faulty fuel level sensor “B” / sending unit (worn resistor card).
- Signal wire shorted to power or to voltage.
- Open or high-resistance ground (corrosion, loose strap).
- Damaged, chafed or pinched wiring or connector.
- Corroded or loose connector at the fuel-pump / sender module.
- Faulty transfer pump on dual-tank systems causing imbalance.
- Faulty instrument cluster or PCM (less common).
4How Serious Is P2068? Can You Keep Driving?
P2068 won't affect how the engine runs. It doesn't impact safety or drivability directly, but an inaccurate or erratic fuel gauge can leave you unexpectedly out of fuel. It's safe to keep driving as long as you track your mileage and fuel manually until it's repaired.
5How to Diagnose the P2068 Code
The focus is the sender circuit and its ground:
- Read P2068 and freeze-frame with a scan tool such as the iCarsoft CR Max P.
- View live data: fuel level sensor “B” voltage/percentage vs sensor “A”, compared to the actual tank level.
- Inspect the tank wiring harness, connector and ground strap for damage or corrosion.
- Voltage-drop test the ground circuit (should be 0.1 V or less).
- Check the signal circuit for a short to power and confirm the reference; apply a known ground at the sender to isolate sensor vs wiring.
6Steps to Fix the P2068 Error Code
- Confirm P2068 and review live fuel-level data (A vs B).
- Inspect and repair the sender connector, wiring and ground — clean corrosion, fix any chafe or short to power.
- Voltage-drop test and restore the ground circuit if it's high-resistance.
- With wiring confirmed good, access the tank and test or replace the fuel level sensor “B” sending unit.
- On dual-tank systems, verify or replace the transfer pump if it's causing imbalance.
- Reconnect, clear codes and refill to a known level.
- Road-test and confirm the gauge reads accurately and the code doesn't return.
7Why the Fuel Sender Matters
The fuel level sender is a simple float-and-resistor that tells the cluster how much fuel is in the tank. On vehicles with two senders, the ECM blends both to get an accurate reading across an oddly-shaped tank. When sender “B” reads high, the gauge can swing wrong — so even though nothing about the engine changes, a reliable sender is what keeps you from an unexpected roadside stop.
8Which iCarsoft Tool to Use
The iCarsoft CR Max P is well suited to a P2068. Its live data shows both fuel-level senders side by side, so you can compare sensor “B” against “A” and the real tank level — which quickly tells you whether the sender or its wiring/ground is at fault.
With CAN-FD support and coverage for 58 vehicle makes, it also confirms the gauge reads correctly again after the repair.
Recommended for P2068
iCarsoft CR Max P
Pro bi-directional scan tool with live fuel-level sensor data, CAN-FD and full-system diagnostics across 58 car brands — to compare both senders and verify a P2068 repair.
$599.99 · was $819.99 · lifelong free updates
Shop CR Max P See full specs9P2068 Repair Cost
Cost depends on whether it's the wiring/ground, the sender or the pump module. Typical ranges (parts + labor):
| Repair | Typical cost |
|---|---|
| Diagnostic (scan) | $75–$150 |
| Fuel level sensor / sender B replacement | $200–$500 |
| Fuel pump module (integrated sender) | $400–$900 |
| Wiring / connector / ground repair | $75–$250 |
| Transfer pump (dual-tank systems) | $250–$600 |
These are general estimates — get a quote once the specific cause is confirmed.
10Prevention & Regular Maintenance
- Avoid routinely running the tank near empty — it reduces sender wear and overheating.
- Use quality fuel and keep the tank reasonably full to limit corrosion and condensation.
- Periodically inspect and clean tank ground connections and connectors.
- Address wiring/connector corrosion early, especially in rust-prone climates.
- Fix small gauge inaccuracies promptly before the sender fully fails.
11Related Trouble Codes
12P2068 — Frequently Asked Questions
Is P2068 safe to drive with?
Yes mechanically, but track your mileage manually since the fuel gauge may be unreliable.
What does sensor “B” mean?
It's the second / auxiliary fuel level sender, used on vehicles with dual or saddle-shaped tanks.
Can a bad ground cause P2068?
Yes — an open or high-resistance ground is a very common cause of a falsely high reading.
Will it fail inspection?
A stored P2068 with the light on can fail a state inspection even though it's a fuel-gauge fault.
Do I have to drop the tank to fix it?
Often yes if the sender is faulty, unless your vehicle has an access panel under the rear seat or cargo floor.
13References
- SAE International, J2012 — Diagnostic Trouble Code Definitions (the standard that defines P2068).
- Wikipedia, Fuel gauge — background on fuel level senders and gauges.
