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P1652

Powertrain Induced Chassis Pitch Output Circuit.

  • Buick
  • 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

On Buick models P1652 means a fault in the Powertrain Induced Chassis Pitch output circuit. This is a signal the engine control module sends to another chassis or ride control module so it can allow for sudden torque changes. The control module saw a voltage or state on that output circuit that did not match what it commanded, such as an open circuit, short to ground or short to voltage. The exact receiving module and wiring depend on the model and year.

Symptoms

  • Check engine light or service vehicle soon message on
  • Ride control or suspension warning message on some models
  • Ride feels harsher, floatier or less controlled under hard acceleration or braking
  • Noticeable body pitch (nose lift or dive) when accelerating or braking
  • No obvious driveability change in many cases

Possible causes

  • Damaged, chafed or corroded wiring on the pitch output circuit (open circuit or short)likely
  • Poor connection or corroded terminals at the engine control module or ride control module connectorslikely
  • Fault in the receiving chassis or ride control module that loads or pulls down the signalpossible
  • Internal fault in the engine control module output driverpossible
  • Water ingress or previous repair damage to the harnesspossible
  • Outdated or faulty control module software, if a manufacturer bulletin applies to the modelrare

How to diagnose

  1. Read all stored and pending codes and note any related chassis, ride control or communication codes
  2. Review freeze frame data and check whether the fault returns straight away or is intermittent
  3. Check battery condition and charging voltage, as low voltage can cause false circuit faults
  4. Inspect the harness and connectors between the engine control module and the ride control module for chafing, corrosion, bent pins or water
  5. Use the wiring diagram for the specific model to identify the pitch output circuit, then test it for continuity, short to ground and short to voltage
  6. Check the voltage or signal on the circuit with the key on and while the system is commanded, using the manufacturer's test procedure
  7. Check the ride control module for its own faults, power and earth supplies, and disconnect it to see if the circuit fault clears
  8. Check for applicable software updates or service bulletins for the model and engine

How to fix

  • Repair or replace damaged wiring and secure the harness away from rubbing points
  • Clean or replace corroded or loose connector terminals
  • Replace the ride control or receiving module if it is found to be loading the circuit
  • Replace the engine control module only if the output driver is confirmed faulty, then program it as required
  • Apply a calibration update only if a known issue for that model and engine is confirmed
  • Clear the codes after repair and road test to confirm it does not return

Can I keep driving?

Low severity

The car can normally be driven, as this fault affects ride comfort and body control rather than engine safety. Book it in soon, and take extra care if the ride feels unusually unstable under braking or acceleration.

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

This code for other makes

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