U0595: Invalid Data from Powertrain Monitor Module
Diagnostic trouble code U0595 indicates that a control module (typically the PCM/ECM or a gateway module) has received invalid data from the Powertrain Control Monitor Module over the CAN bus. The data frame arrived but failed integrity checks such as CRC, rolling counter, or protection value, or the signal values are outside programmed logical limits.
1. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.
2. Most Common Causes
- Faulty Powertrain Control Monitor Module (internal defect)
- Damaged or corroded CAN bus wiring or connectors (open, short, high resistance)
- Software or calibration mismatch between modules
- Low battery voltage or voltage spikes corrupting communication
- Electromagnetic interference (EMI) on the data bus
- Another module on the bus transmitting corrupt data, blocking communication
3. Symptoms You Will Notice
- Check Engine Light illuminated
- Possible drivability issues such as rough idle, hesitation, or reduced power
4. Step-by-Step Diagnosis
Scan for all stored codes and freeze frame data
Inspect CAN bus wiring and connectors for damage, corrosion, or loose connections
Check battery voltage and charging system for stability
Update or reprogram modules with latest manufacturer software
Test the Powertrain Control Monitor Module per service manual procedures
5. Frequently Asked Questions
Is it safe to drive?▼
The vehicle may still be drivable, but reduced performance or unexpected behavior could occur. It is recommended to diagnose and repair the issue promptly to avoid further damage.
How much does it cost to fix?▼
Costs vary widely depending on the root cause: from $100-$200 for a software update or minor wiring repair, to $500-$1,200+ if the Powertrain Control Monitor Module needs replacement.