For Shop Owners

P1635 CHEVROLET - 5-Volt Reference Circuit Low Conditions

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3 What does this mean?

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
What does this mean?

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 CHEVROLET 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.
OBDII Code P1635 Chevrolet - 5-Volt Reference Circuit Low Conditions - itimaster.ru

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P1635 CHEVROLET Comments

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Any information is appreciated. Thanks
Repair Importance Level: 3
1=Low 2=Medium 3=High
Repair Difficulty Level: 3
1=Easy 2=Moderate 3=Hard

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