Home›Trouble Codes›C0523

C0523 — Multi Axis Acceleration Sensor Module B Intermittenterratic

Generic OBD-II · all makesChassis

The code indicates a intermittent fault in the Multi-Axis Acceleration Sensor Module B, which supplies acceleration data to vehicle control systems.

Symptoms

What causes it — most likely first

1. Failed Multi-Axis Acceleration Sensor Module B

The sensor’s internal circuitry or sensing elements have deteriorated, causing intermittent signal loss.

2. Corroded or loose electrical connector

Moisture or oxidation at the sensor’s connector can interrupt the signal intermittently.

3. Damaged wiring harness to the sensor

Chafed, pinched, or broken wires can create intermittent open circuits.

4. Faulty vehicle stability control module

The module that receives sensor data may misinterpret or fail to process the signal correctly.

5. Powertrain control module (PCM) software or hardware issue

A PCM fault can trigger the code, but this is rare compared to sensor or wiring problems.

How it's diagnosed

  1. Scan all modules for additional stored codes and freeze frame data
  2. Inspect the Multi-Axis Acceleration Sensor B connector for corrosion, damage, or loose pins
  3. Measure sensor voltage and resistance while wiggling the harness to replicate intermittent behavior
  4. Perform a functional test of the sensor using a scan tool or multimeter
  5. Check related control module power and ground circuits
  6. If all hardware checks are clear, consider PCM software update or replacement as a last resort

Code facts & related codes

SystemChassis
StandardizationSAE generic — identical on every make
Related codesC0520 — Multi Axis Acceleration Sensor ModuleC0521 — Multi Axis Acceleration Sensor Module C0522 — Multi Axis Acceleration Sensor Module C0524 — Multi Axis Acceleration Sensor Module C0525 — Multi Axis Acceleration Sensor Module C0526 — Steering Angle Sensor Module

Frequently asked

Can I fix this by replacing the PCM?

Replacing the PCM is uncommonly necessary; the issue is usually the sensor, its wiring, or connector.

Will the code clear itself after a repair?

If the underlying fault is resolved, the code will clear after a few drive cycles or can be cleared with a scan tool.

Is this a safety-critical problem?

Yes, because the sensor feeds data to stability and traction control systems that affect vehicle handling.

How long does a typical repair take?

Usually 1‑2 hours to inspect and replace the sensor or repair wiring, depending on accessibility.