OBD-II Generic Error Code U1016: How to Fix It
Medium 1-2 hours Medium Severity
Verified July 2026
- Error Code
- U1016
- Brand
- OBD-II Generic
- Product Type
- automotive
- Severity
- Medium
- DIY Difficulty
- Medium
- Estimated Fix Time
- 1-2 hours
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Tools You'll Need
- Multimeter
- Socket set
- Wire brush
- OBD-II scanner
How to Fix Error Code U1016
-
Check Battery Voltage and Connections
Disconnect negative terminal before cleaning terminals. -
Inspect OBD-II Diagnostic Link Connector (DLC) Wiring
-
Test CAN Bus Wiring
Use proper safety gear when working with electrical systems. -
Check for Blown Fuses
Never use a higher amp fuse than specified. -
Inspect PCM Ground and Power Supply
Disconnect battery before handling PCM connector. -
Perform PCM Reset or Reprogram
Parts You May Need
PCM fuse
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Battery terminals/connectors
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CAN bus wiring harness
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PCM fuse
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Battery terminals/connectors
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CAN bus wiring harness
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When to Call a Professional
If you've checked wiring, fuses, and connections but the code persists, a professional may need to diagnose deeper electrical issues or replace the PCM.Frequently Asked Questions
What does error code U1016 mean?
It indicates a loss of communication with the Powertrain Control Module (PCM) on GM vehicles.
Can a bad battery cause code U1016?
Yes, low battery voltage can disrupt communication between modules.
Is it safe to drive with code U1016?
It may affect drivability and emissions. Get it diagnosed as soon as possible.
Will clearing the code fix U1016?
Clearing the code may temporarily turn off the check engine light, but the underlying issue will likely return.
How much does it cost to fix U1016?
Depends on the cause. Simple fixes like a loose ground cable are cheap; PCM replacement can cost $500-$1000.