5-Volt Reference Circuit Low Conditions
Table of contents
P1635 PONTIAC Possible Causes
- A/C Pressure sensor harness is open or shorted
- MAP sensor harness is open or shorted
- EGR valve harness is open or shorted
How do I fix code P1635 PONTIAC?
Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector’s pins.
Cost of diagnosing the P1635 PONTIAC code
The cost of diagnosing the P1635 PONTIAC code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle’s make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.
When is the code detected
The P1635 code is set when the reference voltage from the sensor is our of range.
Possible Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
P1635 PONTIAC Description
The Powertrain Control Module (PCM) uses a common 5.0 Volt Reference 1 circuit as a sensor feed. This circuit supplies 5 Volts to the following sensors: The Air Condition (A/C) Pressure sensor, the Manifold Absolute Pressure (MAP) sensor, and the Engine Gas Recirculation (EGR) valve. The PCM monitors the voltage on the 5.0 Volt Reference 1 circuit.