Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means there's a problem with the way the car's computer talks to the part that helps the car move. It's like when your phone can't connect to Wi-Fi.
The P1837 code indicates an issue with the Controller Area Network (CAN) communication circuit related to the driveline system.
The driveline communication circuit A is responsible for transmitting data between the vehicle's control modules over the CAN bus. A fault in this circuit can disrupt the flow of information, affecting driveline operations.
• Check Engine Light on
• Transmission shifting issues
• Reduced fuel efficiency
• Faulty CAN bus wiring
• Defective driveline control module
• Poor electrical connections
CAN: Controller Area Network, a robust vehicle bus standard designed to allow microcontrollers and devices to communicate with each other.
Driveline: The group of components that transmit power from the engine to the wheels.
• Use an OBD-II scanner to confirm the code.
• Inspect CAN bus wiring for damage or disconnections.
• Test the driveline control module for faults.
• Repair or replace damaged wiring.
• Ensure all electrical connections are secure.
• Replace the driveline control module if necessary.
• OBD-II scanner
• Multimeter
• Wiring repair kit
$150 - $500
Moderate
• Ford F-150
• Chevrolet Silverado
• Toyota Tacoma
• Regularly inspect wiring for wear and tear.
• Keep electrical connections clean and secure.
• Perform routine maintenance checks.
Communication Issue
• Avoid driving long distances until the issue is resolved.
• Consult a professional mechanic for diagnosis and repair.
Check with your vehicle manufacturer for specific warranty coverage related to electrical components.
This code has been associated with vehicles experiencing communication issues due to aging or damaged wiring.
Moderate – It's important to address this issue soon to prevent drivability problems.
Ignoring this code could lead to safety issues, especially if the vehicle's driveline is affected.
• Vehicle in park or neutral
• Engine running
The driveline control module is typically located near the transmission or under the vehicle's floor.
Q: Can I drive with a P1837 code?
A: It's not recommended to drive for long periods with this code, as it may affect vehicle performance.
Q: Will this code affect my transmission?
A: Yes, it can cause transmission shifting issues if not addressed.
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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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Universal · Wire connectors and repair kit
Useful when diagnosis points toward damaged wiring, corroded terminals, or connector repairs.
Useful if diagnosis points toward damaged connectors, wiring, or terminal repairs.
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