P1652 - FAULT CODE - OBD2

POST UPDATED IN January, 2023

P1652 Code failures by brands

P1652 BUICK, CHEVROLET, CADILLAC, GMC: COOLING FAN 2 RELAY CONTROL CIRCUIT CONDITIONS

Description of DTC code P1652

In most automobiles, manufacturers install cooling fans, which, using an electronic motor, maintain proper engine temperature for optimum engine performance. The PCM (Powertrain Control Module) uses Output Driver Modules (ODM), through which it can switch on current-fed devices that play an important role in engine performance. The ODMs have under their control up to 7 separate outputs that receive a ground signal from the PCM.

DTC P1652 OBDII is set when, with the key on, the PCM detects on the ODM “B” output 2 fault line circuit voltages that turn out to be inconsistent.

Symptoms of fault code P1652

Causes of OBD2 P1652

The reasons for storing the P1652 OBD2 fault code are as follows:

  • Cooling fan relay 2 wiring may be in poor condition.
  • Cooling fan relay 2 circuit connections may be faulty.
  • The cooling fan relay 2 may be faulty.

Possible solutions of the DTC code P1652

In order to troubleshoot the P1652 OBDII diagnostic code consider the following:

  • To start the diagnosis consult the Technical Service Bulletins.
  • Check the cooling fan 2 relay wiring and connections and verify that none of these present common deficiencies. If you detect corrosion, wear, or burns, make corrections.
  • Perform electrical tests on the cooling fan relay 2 and its circuitry, following the manufacturer's recommended diagnostic steps. If after carrying out these checks you detect obvious damage, proceed with the required adjustments.

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