Fault code lookup

PowertrainP3091

Caution

Severity: Caution - get it checked when you can

Signal from auxiliary heater: Always Present; Mechanical failure

15 brands affected · Description from Volkswagen data.

Key terms: Control module: a small computer that runs one part of the car · Powertrain: engine, transmission and emissions

1What it means in plain English

The engine or powertrain control system has stored a fault that does not have specific guidance in this database yet.

2Common causes

  1. Sensor or actuator fault
  2. Wiring or connector fault
  3. Vacuum or intake leak
  4. Fuel or ignition problem
  5. Control module fault

3Can I drive?

Caution · drive with care

Have it diagnosed promptly. If the car runs and drives normally, drive gently to a workshop. If it runs badly, stalls, overheats, loses oil pressure, or a warning light is flashing or red, stop safely and get professional help. If the code concerns the brakes, brake vacuum or brake assist, do not drive until it is checked: a hard pedal or longer stopping distance means stop.

This page gives general information. It is not professional advice. For a definite diagnosis and a repair quote, ask a qualified mechanic to inspect the car.

4Brand data 15

BrandCodeDescriptionSystem
CheryP3091Signal from Auxiliary Heater always Present BrandPowertrain
DaewooP3091No description available Powertrain
DFXKP3091Signal from Auxiliary Heater always Present BrandPowertrain
EOBDP3091Segédfűtés jel BrandPowertrain
GeelyP3091Signal from Auxiliary Heater always Present BrandPowertrain
GMP3091No description available Powertrain
HoldenP3091Intake Camshaft Profile Actuator 7 Control Circuit High Voltage BrandPowertrain
IsuzuP3091No description available Powertrain
MitsubishiP3091Cell internal resistance BrandPowertrain
OpelP3091No description available Powertrain
PeugeotP3091No description available Powertrain
ProtonP3091Cell internal resistance BrandPowertrain
SaabP3091No description available Powertrain
TataP3091No description available Powertrain
VolkswagenP3091Signal from auxiliary heater: Always Present; Mechanical failure BrandPowertrain

Legend: SAE is the generic J2012 description; Brand is text taken from that manufacturer’s data. Manufacturer rows keep the wording and language of the source data, and non-English text is tagged so screen readers pronounce it correctly.

5Related codes

  • P3090 Signal from auxiliary heater: not Present; Lower limit exceeded
  • P3092 Internal control module: memory check sum error; Mechanical failure
  • P3093 Internal control module: memory check sum error; Short to ground
  • P3094 Immobilizer authentication failed
  • P3095 Immobilizer no SIM response
  • P3096 Internal control module: memory check sum error; Short to ground
  • P3097 Control unit faulty
  • P3098 Internal control module: memory check sum error; Open circuit
  • P3099 Internal control module: memory check sum error; Defective
  • P309A Pressure sensor for Disengagment clutch: implausible signal; Lower limit exceeded
  • P309B Exhaust Camshaft Profile Actuator 4 Circuit High Voltage
  • P309C Actuator for disengagement clutch: mechanical malfunction; Short to plus

Browse Pxxx codes or P309xx codes.

OpenDTC - independent fault code reference