P1635 Pontiac Code - 5-Volt Reference Circuit Low Conditions
Quick Answer
The Powertrain Control Module (PCM) uses a common 5.0 Volt Reference 1 circuit as a sensor feed. Common causes include A/C Pressure sensor harness is open or shorted, MAP sensor harness is open or shorted, EGR valve harness is open or shorted. 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
- P1635 Pontiac indicates 5-Volt Reference Circuit Low Conditions.
- Common causes
- Common causes include A/C Pressure sensor harness is open or shorted, MAP sensor harness is open or shorted, EGR valve harness is open or shorted.
- 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 P1635 Pontiac Description
What are the Possible Causes of the DTC P1635 Pontiac?
- A/C Pressure sensor harness is open or shorted
- MAP sensor harness is open or shorted
- EGR valve harness is open or shorted
How to Fix the DTC P1635 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 P1635 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 P1635 Pontiac Code
1. What does the OBDII code P1635 mean for a Pontiac?
P1635 indicates a problem with the 5-volt reference circuit, which is running at a lower voltage than expected.
2. What are the common symptoms of code P1635 in a Pontiac?
Symptoms can include engine performance issues, poor acceleration, stalling, and warning lights like the Check Engine Light.
3. What causes the P1635 code in a Pontiac?
Common causes include a damaged wiring harness, short circuits, faulty sensors, or a malfunctioning powertrain control module (PCM).
4. Can a bad sensor trigger the P1635 code on a Pontiac?
Yes, a faulty sensor relying on the 5-volt reference circuit, such as the throttle position sensor or MAP sensor, can cause this code.
5. How do you diagnose the P1635 code on a Pontiac?
Start by checking the 5-volt reference circuit wiring for damage, testing related sensors, and verifying the PCM operation.
6. Is it safe to drive a Pontiac with code P1635?
Driving with this code may lead to engine performance issues and potential stalling, so it’s best to address it promptly.
7. Can the P1635 code be caused by a failed PCM in a Pontiac?
Yes, a malfunctioning PCM can fail to deliver the correct 5-volt reference signal, causing this code.
8. How can the P1635 code be fixed on a Pontiac?
Repairs may include replacing damaged wiring, fixing shorts, replacing faulty sensors, or repairing/replacing the PCM.
9. Will clearing the code fix the P1635 issue on a Pontiac?
Clearing the code won’t fix the underlying issue; proper diagnosis and repair are required to prevent the code from returning.
10. What tools are needed to troubleshoot the P1635 code on a Pontiac?
You’ll need a multimeter to test voltage, an OBDII scanner for diagnostics, and possibly wiring diagrams for your vehicle.
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