Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
The car's computer is having trouble talking to another part of the car. It's like when you send a text message and it doesn't go through.
The Controller Area Network (CAN) is a system that allows different parts of the car to communicate with each other. This code indicates a problem with the communication signals.
P1654 is a diagnostic trouble code indicating that the CAN bus, a communication network in the vehicle, is experiencing a timeout issue. This means that one or more control modules are not receiving the expected messages within a certain time frame.
• Check Engine Light is on
• Malfunctioning electronic systems
• Intermittent vehicle performance issues
• Faulty control module
• Wiring issues or poor connections in the CAN bus
• Faulty CAN bus communication line
CAN: Controller Area Network, a vehicle bus standard designed to allow microcontrollers and devices to communicate with each other.
Timeout: A period of time after which a process is terminated if it hasn't been completed.
• Verify the code using an OBD-II scanner.
• Inspect the wiring and connections in the CAN bus for damage or corrosion.
• Test the functionality of control modules involved.
• Repair or replace damaged wiring or connectors.
• Replace faulty control module.
• Ensure proper grounding and connections in the CAN bus.
• OBD-II scanner
• Multimeter
• Wiring repair tools
$100 - $1000 depending on the extent of the issue
Moderate
• Chevrolet Silverado
• GMC Sierra
• Pontiac Grand Prix
• Regular maintenance checks on vehicle wiring
• Avoiding exposure to moisture and corrosive environments
• Using quality replacement parts
Communication Error
• Do not ignore the Check Engine Light.
• Consult a professional mechanic for diagnosis and repair.
Check with your vehicle manufacturer for specific warranty coverage on electronic components.
This code has been associated with communication issues in vehicles with complex electronic systems.
Moderate – Should be addressed to prevent further communication issues.
Ignoring communication errors can lead to malfunctioning safety systems. Always address these issues promptly.
• Vehicle must be running
• All electronic systems should be operational
The CAN bus wiring is typically located throughout the vehicle, connecting various control modules.
Q: What happens if I ignore this code?
A: Ignoring this code can lead to malfunctioning vehicle systems and potential safety risks.
Q: Can I drive my car with this code?
A: While the car may still be drivable, it's not recommended as it could lead to further issues.
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Universal · Digital multimeter
A solid entry-level multimeter for voltage, continuity, resistance, and basic electrical troubleshooting.
Helpful for checking voltage drops, grounds, and basic circuit health when modules are not communicating.
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Useful when diagnosis points toward damaged wiring, corroded terminals, or connector repairs.
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