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P1652

Powertrain Induced Chassis Pitch Output Circuit.

  • Cadillac
  • 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 a Cadillac means the engine control module has detected a fault in the Powertrain Induced Chassis Pitch output circuit. This is a signal the ECM sends to the ride control system to help manage body pitch under acceleration and braking. The ECM sets the code when the circuit voltage or signal does not match what it commands, which points to an open, short or poor connection rather than a mechanical fault.

Symptoms

  • Check engine or service ride control warning light on
  • Ride control or suspension warning message on the dashboard
  • Ride feels firmer, softer or less controlled under hard acceleration or braking
  • Noticeable body pitch or nose dive that was not there before
  • Intermittent warning that comes and goes with wiring movement or damp weather

Possible causes

  • Damaged, chafed or corroded wiring in the pitch output circuit between the ECM and the ride control modulelikely
  • Poor connection or corrosion at the ECM or ride control module connectorlikely
  • Short to ground, short to voltage or open circuit in the output linepossible
  • Fault in the ride control or suspension control module that receives the signalpossible
  • Low system voltage or poor earth connections affecting the signalpossible
  • Internal fault in the engine control module output driverrare

How to diagnose

  1. Read all stored and pending codes and record the freeze frame data, noting any ride control or communication codes on other modules.
  2. Check battery condition and charging voltage, as low voltage can cause spurious circuit faults.
  3. Visually inspect the wiring and connectors between the ECM and the ride control module for chafing, water ingress, corrosion and pushed-out pins.
  4. Clear the code and see whether it returns immediately or only under certain conditions, wiggling the harness while monitoring live data if possible.
  5. Using the manufacturer wiring diagram for the specific model and year, test the output circuit for continuity, short to ground and short to voltage.
  6. Check the relevant earth points and power supplies to both the ECM and the ride control module.
  7. Check for applicable service bulletins and software updates for the model, as the circuit and module arrangement vary by model and year.

How to fix

  • Repair or replace damaged wiring in the pitch output circuit.
  • Clean or replace corroded or loose connectors and terminals.
  • Restore good earth and power supply connections.
  • Replace or reprogram the ride control module if it is confirmed faulty.
  • Replace or reprogram the engine control module only after wiring and the receiving module have been proven good, and apply any outdated calibration update if one is known for the vehicle.

Can I keep driving?

Low severity

The car can normally be driven, but ride and handling may feel different under hard acceleration or braking, so drive gently. Book it in for diagnosis soon.

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

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