U0010-CAN Interior Bus

U0010 Code - The Controller Area Network (CAN) Bus is a serial two wire bus communication system for transferring data between control modules. The CAN Bus types a vehicle may have one or more types of CAN Bus. CAN B is a medium-speed bus, which operates at 83.3 kbps. CAN C is a high-speed bus which operates at 500 kbps. A second high-speed bus, diagnostic CAN C, is designed to communicate with a diagnostic tool. The newest version of CAN is interior High Speed CAN (or IHS), which will operate at 125 kbps, and will appear on vehicles in the future. CAN B is event-driven, opening a door will awaken most modules on the bus. Up to 32 modules are permitted, interior High Speed CAN will be event-driven, and will use CAN C modules with reduced clock speed.

When monitored:

• With the ignition on.

Set condition:

• The Totally Integrated Control Module (TIPM) or Body Control Module (BCM) detects a short to ground on the CAN Interior Bus (125K) (+) circuit or a short to voltage on the CAN Interior Bus (125K) (-) circuit.

Possible causes :

• CAN Interior Bus (125K) (+) cirucit shorted to ground.
• CAN Interior Bus (125K) (-) circuit shorted to voltage.
• Any CAN Interior Bus Module.
• Totally Intaegrated Power Module (TIPM) or Body Control Module (BCM).

Diagnose DTC U0010-CAN Interior Bus

Step 1. Test for intermittent condition

Turn the ignition on, with the scan tool erase DTC. Cycle the ignition from on to off three times, turn the ignition on, with the scan tool read active DTC.

Does the scan tool display this DTC as active ?

Yes, go to step 2.

No. test complete, the condition or conditions that originally set this DTC are not present at this time. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals, and correct pin tension.

Step 2. Any CAN Interior Bus (125K) Module - Internal short

When performing this step, turn the ignition off (wait one minute) before disconnecting any module. When the module is disconnected turn the ignition on. This step is to determine if the fault is internal within a module.

While monitoring the scan tool, disconnected each CAN Interior Bus (125K) module (except for the TIPM), one at a time. Check for this DTC to become active after disconnecting each CAN Interior Bus (125K) module the vehicle is equipped with. If the DTC becomes stored when a particular module is disconnected, that module is causing the DTC to set.

With all the CAN Interior Bus modules disconnected, does the scan tool display this DTC as active ?

Yes, go to step 3.

No, replace the module that when disconnected caused this DTC to become stored.

Step 3. Check the CAN Interior Bus (125K) (+) circuit for a short to ground

Turn the ignition off, measure the resistance between ground and the CAN Interior Bus (125K) (+) circuit at the TIPM/BCM harness connector.

Is any resistance present ?

Yes, repair the short to ground in the CAN Interior Bus (125K) (+) circuit.

No, go to step 4.

Step 4. Check the CAN Interior Bus (125K) (-) circuit for a short to voltage

Turn the ignition on, measure the voltage at the CAN Interior Bus (125K) (-) circuit at the TIPM/BCM harness connector.

Is the voltage above 6 volts ?

Yes, repair the short to voltage in the CAN Interior Bus (125K) (-) circuit.

No, inspect the wiring and connectors for damage or short circuits. If OK, replace the TIPM/BCM. Perform the Body Verification Test.

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