P0656 Pontiac Code - Fuel Level Output Circuit Malfunction
Quick Answer
The Powertrain Control Module (PCM) controls the fuel gauge through the fuel gauge control circuit. Common causes include Faulty Fuel Level Gauge, Fuel Level Gauge harness is open or shorted, Fuel Level Gauge circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P0656 Pontiac indicates Fuel Level Output Circuit Malfunction.
- Common causes
- Common causes include Faulty Fuel Level Gauge, Fuel Level Gauge harness is open or shorted, Fuel Level Gauge circuit poor electrical connection.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code P0656 Pontiac Description
The PCM controls the gauge by grounding the control circuit via an internal switch called a driver. The primary function of the driver is to supply the ground for the controlled component. Each driver has a fault line which the PCM monitors.
What are the Possible Causes of the DTC P0656 Pontiac?
- Faulty Fuel Level Gauge
- Fuel Level Gauge harness is open or shorted
- Fuel Level Gauge circuit poor electrical connection
- Faulty Powertrain Control Module (PCM)
How to Fix the DTC P0656 Pontiac?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0656 Pontiac code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Frequently Asked Questions about P0656 Pontiac Code
1. What does the OBDII code P0656 mean on a Pontiac?
P0656 indicates a malfunction in the fuel level output circuit, which means the system responsible for transmitting fuel level data to the instrument cluster is not working properly.
2. What are the symptoms of code P0656 in a Pontiac?
Common symptoms include an inaccurate or non-functional fuel gauge, the check engine light turning on, and potential erratic fuel level readings.
3. What causes the P0656 code to appear in a Pontiac?
Possible causes include a faulty fuel level sensor, damaged wiring or connectors in the fuel level circuit, a defective instrument cluster, or an issue with the powertrain control module (PCM).
4. Can I drive my Pontiac with a P0656 code?
You can drive with a P0656 code, but it may be unsafe since the fuel gauge may not display the correct fuel level, increasing the risk of running out of fuel unexpectedly.
5. How is the P0656 code diagnosed in a Pontiac?
A mechanic will typically use a scan tool to confirm the code, inspect the fuel level sensor and wiring for damage, and test the circuit's continuity and voltage to pinpoint the issue.
6. How do I fix the P0656 code on my Pontiac?
Repairs may involve replacing the fuel level sensor, repairing or replacing damaged wiring or connectors, reprogramming or replacing the PCM, or fixing issues with the instrument cluster.
7. How much does it cost to fix the P0656 code in a Pontiac?
Repair costs can vary widely, ranging from $100–$500 or more, depending on whether only minor wiring repairs are needed or if major components like the fuel level sensor or PCM require replacement.
8. Can a bad fuel pump cause the P0656 code in a Pontiac?
A bad fuel pump itself is unlikely to trigger P0656, but if the pump assembly includes the fuel level sensor and it’s faulty, it could cause the code.
9. What tools are needed to troubleshoot the P0656 code on a Pontiac?
Tools typically needed include a diagnostic scan tool, a multimeter to test wiring and continuity, and possibly a fuel pump module removal tool if the fuel level sensor needs replacement.
10. Will clearing the P0656 code fix the problem on my Pontiac?
Clearing the code will turn off the check engine light temporarily, but the underlying issue must be repaired to prevent the code from returning.
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