U011E

Code

Generic U — Network/User

Lost Communication With Throttle Actuator B Control Module

Brand: Generic

Type: U — Network/User

Views: UK: 23 EN: 35 RU: 27

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Page language: EN

Retrieve freeze frame and DTC history with a capable scan tool; note time and conditions
Check battery voltage (engine off and cranking) and charging system output
Inspect fuses and relay powering the TAC-B module and related circuits
Visually inspect TAC-B connector for corrosion, bent pins, water intrusion, or damage
Check module grounds for security and corrosion; measure resistance to chassis ground
Attempt to communicate with the TAC-B module using a scan tool

Battery supply to module: ~12.0–14.5 V (key on/engine running as appropriate)
Ground continuity: near 0 ohms to chassis ground at module
CAN High (idle recessive): approx 2.5–3.5 V
CAN Low (idle recessive): approx 1.5–2.5 V
Dominant differential voltage (CANH - CANL) during frames: typically ~1.5–3.0 V
Bus termination resistance (power off): ~60 ohms (two 120 Ω resistors in parallel)

Confirm the code and note any accompanying U- or P-codes. Record freeze frame data.
Verify battery voltage and charging system operation. Poor supply can cause network timeouts.
Check fuses and relays that power the TAC-B module; replace if blown and retest.
Visually inspect the TAC-B connector and wiring for damage, corrosion, or moisture. Repair as needed.
Check module ground(s) for tightness and corrosion; clean and tighten ground connections.
Use a scan tool to attempt communication with TAC-B. If no communication, try another known-good scan tool or known-good gateway/adapter if available.
With ignition on, measure CANH and CANL at the TAC-B connector. Compare voltages to expected ranges and look for missing or noisy signals with an oscilloscope.
With power off, measure resistance between CANH and CANL to confirm proper termination (~60 Ω).
If wiring and bus signals are good but no module response, disconnect TAC-B and check for shorts to battery or ground on its pins.
If wiring and network are good and the module does not respond, consider module repair or replacement. Follow manufacturer procedures for programming/reflashing after replacement.
After repairs, clear codes and perform a road test to confirm the issue is resolved and the code does not return.