Code
U2002
DS
U — Network/User
Remotely controlled reawakening mode fault: Short circuit to earth
Views:
UK: 5
EN: 3
RU: 4
AI status
Completed
Completed
100%
Causes
- Damaged wiring harness or chafed conductor shorting to chassis ground
- Corroded or damaged connector causing low-resistance path to earth
- Failed remote wake/telematics module output transistor or driver shorted to ground
- Aftermarket equipment or incorrect repairs creating a ground fault
- Water ingress in connector or module
Symptoms
- Remote wake/remote start functions do not operate
- Vehicle does not wake from sleep via remote/telemetry or behaves intermittently
- Reduced battery drain if repeated attempts occur, or abnormal battery drain in some cases
- Stored U2002 and possibly other communication/wakeup related U-codes
- Related modules not responding to remote requests
What to check
- Read all stored U-codes and freeze frame data with a capable scan tool; record any related network codes
- Inspect wiring harnesses and connectors on telematics/remote control module, gateway and junctions for damage, corrosion or water
- Visually inspect for aftermarket alarm/remote-start devices and associated splices
- Measure voltage on the wake/reawakening control line with engine off and while attempting remote wake
- Perform continuity and resistance tests between wake signal wire and chassis ground with battery disconnected
- Use a scope or logic analyzer to observe wake signal waveform during a remote wake attempt (if available)
Signal parameters
- Wake control line active voltage: nominal battery voltage (~12 V) when driven high; 0 V when low/grounded
- Short-to-earth indication: very low resistance from wake wire to chassis ground (typical short < 5 ohm)
- Open/normal idle: high impedance / open-circuit to ground (kΩ range); no continuous battery drain
- Wake pulse waveform: short pulses or a defined sequence from telematics module — use oscilloscope to verify shape and amplitude
Diagnostic algorithm
- Retrieve and note all DTCs and freeze frame data with a qualified scan tool. Clear codes and attempt to reproduce U2002 to confirm persistence.
- Disable vehicle battery and visually inspect harnesses, connector bodies and pins at the telematics/remote module, gateway module and any related junctions for damage, corrosion or water intrusion. Repair any obvious damage.
- With battery reconnected, measure DC voltage between the wake control wire and chassis ground. If permanently near 0 V, suspect short to ground.
- With ignition off, disconnect the telematics/remote module connector and measure resistance from the wake control wire (at module harness side) to chassis ground. A low resistance indicates a short in the harness/aftermarket device downstream.
- If harness side is open to ground, reconnect module and carefully probe the wake output at the module pin while commanding a remote wake using the scan tool or remote. Use an oscilloscope if available. If the module driver never drives high but module reports a short, suspect internal module fault.
- Isolate sections: unplug intermediate connectors/junctions and retest continuity to ground to localize the short. Inspect and repair any splices or routed areas near metal edges where chafing can occur.
- Remove or isolate aftermarket/aftermarket alarm components and retest. Replace or repair any faulty aftermarket wiring.
- If wiring and connectors are good but the output remains shorted only when module is connected, replace the telematics/remote module per manufacturer procedure and reprogram if required.
- After repair, clear codes and verify normal remote wake operation and absence of U2002 under normal conditions. Perform a full network scan to ensure no related faults remain.
Likely causes
- Short in the wake/reawakening control signal wire to chassis ground (most likely)
- Faulty telematics/remote-control module output stage
- Connector pins bent/corroded at module or junction connector
- Accessory or aftermarket alarm/remote start tied into wake circuit
Fault status
Status
Remotely controlled reawakening mode: signal short to earth detected on wake control circuit.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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