Code
B2311
HUMMER
B — Body
TRU Failure
AI status
Completed
Completed
100%
Causes
- Blown fuse or tripped relay supplying the TRU
- Poor or corroded ground or power connection at the TRU
- Damaged wiring harness or connector (open/short/intermittent) to the TRU
- Water intrusion or physical damage to the TRU or connector
- Antenna or antenna coax/coupler fault (if TRU is radio/telematics)
- Bus communication fault (CAN/LIN/serial) between TRU and other modules
Symptoms
- Telematics or remote services inoperative (e.g., remote unlock, OnStar-like services, subscription services)
- Loss of features controlled by the TRU (remote start, GPS, SOS, cellular pairing, etc.)
- Warning or information lamp/message related to telematics/communication
- Stored B2311 and possibly related communication DTCs
- Intermittent or permanent loss of two-way communication with vehicle from external networks
- Possible increased battery drain if TRU is stuck awake
What to check
- Retrieve all stored/active DTCs and freeze frame data with a dealer-level or capable scan tool
- Check service bulletins / software updates related to B2311 or TRU module
- Verify battery voltage at vehicle (should be ~12.4–13.5 V with key off; ~13.5–14.7 V with engine running)
- Inspect TRU connector for corrosion, bent pins, water, or damage; perform a secure seating check
- Check fuses and relays that feed the TRU (replace if blown)
- Verify ground(s) to TRU: perform continuity test to chassis ground and measure resistance (
Signal parameters
- Battery supply to TRU: ~11–15 V (key on/normal operating conditions)
- Ground continuity:
- CAN bus idle voltages: both lines near ~2.5 V (recessive); dominant state sees CANH ~3.5 V and CANL ~1.5 V (differential ~2 V)
- Module should respond to diagnostic scan tool queries and publish expected message IDs at regular intervals (typical message rates vary by vehicle feature, often 1–10 Hz)
- Antenna/coax continuity: near 0 Ω to expected terminations (visual/ohm check)
Diagnostic algorithm
- Connect an appropriate scan tool; record B2311 and any other stored codes and freeze frame data. Check for related U-codes (communication) or additional B-codes.
- Verify vehicle battery state of charge and system voltage. Low battery can cause module failures — recharge or replace battery if necessary.
- Inspect TRU connector and harness visually for corrosion, water intrusion, rubbed-through insulation, or damage. Repair any harness damage before further testing.
- Check and replace fuses/relays that supply the TRU. Confirm voltage at the TRU power pin with backprobe while fuses are in place.
- Verify ground(s) at the TRU: remove connector and measure continuity to chassis ground. Clean and secure ground if >1 Ω or visually corroded.
- Using the scan tool, verify whether the TRU is present on the network. If the module is not responding, check CAN/LIN continuity and termination resistances. Use a digital scope to verify proper CANH/CANL signals if available.
- Wiggle-test the harness and connector while monitoring the module presence/voltage to identify intermittent connections.
- If antenna-related features fail, check antenna connector continuity and inspect antenna feed/coax for short/open.
- If wiring/power/ground/antenna are good but TRU still fails, check for available software updates or reflash/perform a module reset per factory procedure.
- If reprogramming does not restore function, replace the TRU with a new or verified-good unit and program it to the vehicle per manufacturer procedure. Clear codes and retest all affected systems.
- After repair, monitor for reoccurrence and verify that no additional network errors remain.
Likely causes
- No battery power at the TRU due to blown fuse or connector fault
- CAN bus or LIN wiring open/short preventing module communications
- Corroded/loose ground at TRU causing intermittent operation
- Antenna fault causing TRU RF functions to error (if applicable)
- Internal TRU electronics failure requiring replacement or reflash
Fault status
Status
TRU Failure — telematics/transceiver unit not operating or not communicating. Check power, ground, connectors, CAN/LIN network and antenna; module reprogramming or replacement may be required.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
B2311
Other
B — Body
Mirror Passenger Memory Position Error
AI status
Completed
Completed
100%
Causes
- Blown fuse or tripped relay supplying the TRU
- Poor or corroded ground or power connection at the TRU
- Damaged wiring harness or connector (open/short/intermittent) to the TRU
- Water intrusion or physical damage to the TRU or connector
- Antenna or antenna coax/coupler fault (if TRU is radio/telematics)
- Bus communication fault (CAN/LIN/serial) between TRU and other modules
Symptoms
- Telematics or remote services inoperative (e.g., remote unlock, OnStar-like services, subscription services)
- Loss of features controlled by the TRU (remote start, GPS, SOS, cellular pairing, etc.)
- Warning or information lamp/message related to telematics/communication
- Stored B2311 and possibly related communication DTCs
- Intermittent or permanent loss of two-way communication with vehicle from external networks
- Possible increased battery drain if TRU is stuck awake
What to check
- Retrieve all stored/active DTCs and freeze frame data with a dealer-level or capable scan tool
- Check service bulletins / software updates related to B2311 or TRU module
- Verify battery voltage at vehicle (should be ~12.4–13.5 V with key off; ~13.5–14.7 V with engine running)
- Inspect TRU connector for corrosion, bent pins, water, or damage; perform a secure seating check
- Check fuses and relays that feed the TRU (replace if blown)
- Verify ground(s) to TRU: perform continuity test to chassis ground and measure resistance (
Signal parameters
- Battery supply to TRU: ~11–15 V (key on/normal operating conditions)
- Ground continuity:
- CAN bus idle voltages: both lines near ~2.5 V (recessive); dominant state sees CANH ~3.5 V and CANL ~1.5 V (differential ~2 V)
- Module should respond to diagnostic scan tool queries and publish expected message IDs at regular intervals (typical message rates vary by vehicle feature, often 1–10 Hz)
- Antenna/coax continuity: near 0 Ω to expected terminations (visual/ohm check)
Diagnostic algorithm
- Connect an appropriate scan tool; record B2311 and any other stored codes and freeze frame data. Check for related U-codes (communication) or additional B-codes.
- Verify vehicle battery state of charge and system voltage. Low battery can cause module failures — recharge or replace battery if necessary.
- Inspect TRU connector and harness visually for corrosion, water intrusion, rubbed-through insulation, or damage. Repair any harness damage before further testing.
- Check and replace fuses/relays that supply the TRU. Confirm voltage at the TRU power pin with backprobe while fuses are in place.
- Verify ground(s) at the TRU: remove connector and measure continuity to chassis ground. Clean and secure ground if >1 Ω or visually corroded.
- Using the scan tool, verify whether the TRU is present on the network. If the module is not responding, check CAN/LIN continuity and termination resistances. Use a digital scope to verify proper CANH/CANL signals if available.
- Wiggle-test the harness and connector while monitoring the module presence/voltage to identify intermittent connections.
- If antenna-related features fail, check antenna connector continuity and inspect antenna feed/coax for short/open.
- If wiring/power/ground/antenna are good but TRU still fails, check for available software updates or reflash/perform a module reset per factory procedure.
- If reprogramming does not restore function, replace the TRU with a new or verified-good unit and program it to the vehicle per manufacturer procedure. Clear codes and retest all affected systems.
- After repair, monitor for reoccurrence and verify that no additional network errors remain.
Likely causes
- No battery power at the TRU due to blown fuse or connector fault
- CAN bus or LIN wiring open/short preventing module communications
- Corroded/loose ground at TRU causing intermittent operation
- Antenna fault causing TRU RF functions to error (if applicable)
- Internal TRU electronics failure requiring replacement or reflash
Fault status
Status
TRU Failure — telematics/transceiver unit not operating or not communicating. Check power, ground, connectors, CAN/LIN network and antenna; module reprogramming or replacement may be required.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
Similar codes
Repair manuals
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