Skip to content
GTECH Calibration
Portal

P1652

Powertrain Induced Chassis Pitch Output Circuit.

  • Oldsmobile
  • Powertrain
  • Manufacturer code
  • Low severity

How this code is built

P
SystemPowertrain
1
Defined byThe manufacturer
6
AreaComputer and output circuits
52
FaultThe specific fault in that area

What it means

P1652 on an Oldsmobile is a GM-specific code for the Powertrain Induced Chassis Pitch output circuit. The engine control module (PCM) sends a signal about torque and load changes to the ride or suspension control system, so the suspension can limit body pitch during harsh acceleration or shifts. The code sets when the PCM sees an electrical fault on that output, such as an open circuit, a short to ground or a short to voltage. Which module receives the signal depends on the model and year.

Symptoms

  • Warning light on, or a suspension or ride control message on models fitted with that system
  • Ride feels firmer or softer than normal, or does not adapt under hard acceleration
  • More body pitch or squat when accelerating hard or under sudden throttle changes
  • Other ride control or suspension fault codes stored alongside P1652
  • No noticeable change in how the car drives

Possible causes

  • Damaged, chafed or corroded wiring on the pitch signal circuit between the PCM and the ride control modulelikely
  • Poor connection at the PCM or ride control module connectors (corrosion, bent or loose pins)likely
  • Fault in the ride or suspension control module that receives the signal, loading or shorting the circuitpossible
  • Circuit shorted to ground or to voltage by another damaged harness or aftermarket wiring workpossible
  • Water ingress or previous repair damage in the harness near the bulkhead or under the seats, where modules often sitpossible
  • Internal fault in the PCM output driverrare

How to diagnose

  1. Read all stored codes from the PCM and the ride or suspension control module, and note freeze frame data and whether the code is current or history.
  2. Check that other related codes (ride control, battery or ground faults) are not pointing to a wider supply problem.
  3. Visually inspect the harness between the PCM and the ride control module for chafing, rodent damage, melted insulation and previous repairs.
  4. Disconnect and inspect the connectors at both modules for corrosion, water, bent or pushed-back pins, and check terminal tension.
  5. Using the correct wiring diagram for the model and year, test the signal circuit for continuity, short to ground and short to voltage with the ignition off and the connectors disconnected.
  6. Check the power and ground supplies to the ride control module and confirm the battery voltage is healthy.
  7. With the circuit proven good, test or swap-check the ride control module if the diagnostic information for that model allows it.
  8. Only consider the PCM once the wiring and the receiving module have been cleared.

How to fix

  • Repair or replace damaged wiring on the pitch signal circuit, using proper soldered and sealed repairs.
  • Clean, repair or replace corroded or damaged connectors and terminals at the PCM and ride control module.
  • Correct any short caused by other wiring damage or aftermarket installations.
  • Replace the ride or suspension control module if it is confirmed faulty.
  • Replace or repair the PCM only if the output driver is confirmed faulty after all else has been ruled out, then clear the code and road test.

Can I keep driving?

Low severity

The car can normally be driven as the fault only affects the ride adjustment feature, though handling under hard acceleration may feel different. Book it in for diagnosis at your convenience.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.

This code for other makes

Nearby codes