P1651 Chevrolet Code - PCM Output Controls Fault
Quick Answer
The Quad Driver Module (QDM) is an electronic switch that completes a ground circuit when switched on. Common causes include Faulty Powertrain Control Module (PCM), Powertrain Control Module harness is open or shorted, Powertrain Control Module 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
- P1651 Chevrolet indicates PCM Output Controls Fault.
- Common causes
- Common causes include Faulty Powertrain Control Module (PCM), Powertrain Control Module harness is open or shorted, Powertrain Control Module 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 P1651 Chevrolet Description
The Diagnostic Trouble Code (DTC) P1650 and P1651 will set if there is an open, short to ground or short to voltage on any of the QDM output circuits, faulty MIL circuit, faulty upshift light circuit, faulty cooling fan relay circuit or A/C relay circuit. Fault detected for 5 seconds will set P1651. Fault detected for 20 seconds will set P1650. The QDM circuit is continuously checked when the engine is running.
The Quad Driver Module (QDM) is part of the Powertrain Control Module (PCM).
What are the Possible Causes of the DTC P1651 Chevrolet?
- Faulty Powertrain Control Module (PCM)
- Powertrain Control Module harness is open or shorted
- Powertrain Control Module circuit poor electrical connection
How to Fix the DTC P1651 Chevrolet?
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 P1651 Chevrolet 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 P1651 Chevrolet Code
1. What are the common symptoms of OBDII code P1651 (PCM Output Controls Fault) in a Chevrolet vehicle?
- Common symptoms include engine stalling, rough idling, poor acceleration, and the Check Engine light being illuminated.
2. What are some possible causes of OBDII code P1651 in a Chevrolet?
- The code P1651 in a Chevrolet could be triggered by a faulty PCM (Powertrain Control Module), damaged wiring, or issues with the PCM output control circuit.
3. How can I diagnose the OBDII code P1651 in my Chevrolet?
- To diagnose the code P1651, you can use an OBDII scanner to read the trouble codes, inspect the wiring for damage, and test the PCM output control circuit with a multimeter.
4. What are the recommended repair tips for addressing code P1651 in a Chevrolet?
- Repair tips for code P1651 may include checking and repairing any damaged wiring, replacing the PCM if necessary, and ensuring all connections are secure and free of corrosion.
5. Can I drive my Chevrolet with OBDII code P1651 present?
- It is not recommended to drive your Chevrolet with code P1651 present, as it can lead to further damage to the vehicle and potential safety hazards. It's best to address the issue promptly.
6. How much does it typically cost to repair OBDII code P1651 in a Chevrolet?
- Repair costs for OBDII code P1651 can vary depending on the exact cause of the issue. It's advisable to consult a professional mechanic for an accurate diagnosis and cost estimate.
7. Will resetting the OBDII code P1651 in my Chevrolet make it go away permanently?
- Simply resetting the code P1651 may temporarily clear the Check Engine light, but if the underlying issue is not addressed, the code is likely to return. It's important to diagnose and repair the root cause of the problem.
8. Is it possible to prevent OBDII code P1651 from occurring in my Chevrolet?
- While some causes of code P1651 may be unavoidable, regular maintenance, keeping up with recommended service intervals, and promptly addressing any issues that arise can help reduce the likelihood of encountering this fault code.
9. Can a DIY enthusiast with basic automotive knowledge fix OBDII code P1651 in a Chevrolet?
- Depending on the specific cause of the code P1651, a DIY enthusiast with basic automotive knowledge may be able to address the issue by following repair guides and utilizing the necessary tools. However, complex electrical issues may require professional assistance.
10. How long does it take to repair OBDII code P1651 in a Chevrolet?
- The time required to repair OBDII code P1651 can vary based on the cause of the issue, the availability of parts, and the expertise of the individual performing the repair. It's advisable to consult a mechanic for a more accurate estimate of the repair duration.
Discuss the causes and fixes for P1651 Chevrolet OBDII Code
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I have a 1998 Monte Carlo code p1651 the engine fans are not coming on unless I turn on the a/c or if I unplug the temp sensor. Also a code p0118 for the low coolant light stays on. I have replaced all three fan relays the temp sensor and the low coolant sensor also the thermostat but still the fans do not come on without the a/c on or the temp sensor unplugged. Does anyone have any info as to what to do or check next. Thanks tex
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