B2162: Data Bus Communication Failure
Diagnostic trouble code B2162 indicates a communication failure on the vehicle's data network, typically the CAN bus (HS-CAN or MS-CAN). The receiving module, often the Instrument Panel Cluster (IPC), has detected that data received from another module—such as the PCM, ABS, or BCM/GEM—does not match expected values, checksum, or programmed As-Built Data. This usually results from incorrect module configuration, incompatible software versions between modules, or data corruption during transmission.
1. Commonly Affected Makes
2. Most Common Causes
- Incorrect or missing As-Built Data configuration after module replacement
- Internal failure of the transmitting or receiving module (processor or memory)
- Open circuit, short circuit, or interference on the CAN High/Low bus
- Low battery voltage or voltage spikes corrupting data transmission
3. Symptoms You Will Notice
- Malfunction indicator lamp (MIL) or warning lights on the instrument cluster
- Inoperative or erratic gauges, displays, or vehicle functions
4. Step-by-Step Diagnosis
Check for related DTCs in other modules and verify battery voltage is stable (12.6V or higher).
Inspect CAN bus wiring for opens, shorts, or damage; measure resistance between CAN High and Low (should be ~60 ohms).
Verify module software versions and As-Built Data using a factory-level scan tool; reprogram or configure as needed.
If wiring and configuration are correct, isolate the fault by disconnecting modules one at a time to identify the defective module.
5. Frequently Asked Questions
Is it safe to drive?▼
The vehicle may still be drivable, but some systems (e.g., gauges, stability control) may not function properly. It is recommended to diagnose and repair promptly to avoid further issues.
How much does it cost to fix?▼
Costs vary widely: from $100–$200 for a simple reprogramming to $500–$1,500+ if a module needs replacement and programming.