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Home / DTC / U012E — Lost Communication With Camshaft Position Control Module

U012E — Lost Communication With Camshaft Position Control Module

Detailed page for trouble code U012E.

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Code

U012E

Generic U — Network/User

Lost Communication With Camshaft Position Control Module

Brand: Generic
Type: U — Network/User
Views: UK: 12 EN: 14 RU: 11
AI status
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ready
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Page language: EN

Causes

  • Open or shorted CAN/data wiring between the camshaft control module and the network
  • Faulty camshaft position control module (internal failure)
  • Poor power or ground to the camshaft control module
  • Missing or incorrect CAN bus termination resistors (open/low/short)
  • Corroded/wet/damaged connector at the module
  • Module programming/mismatch or module replaced but not configured

Symptoms

  • Malfunction Indicator Lamp (MIL) on
  • Engine may run poorly, misfire, or enter limp mode if cam data missing
  • No camshaft position data shown on a scan tool for that module
  • Multiple communication-related DTCs from other modules
  • Intermittent drivability issues or engine stalling

What to check

  • Scan vehicle and confirm U012E is current or history; capture freeze frame and related codes
  • Verify other modules on CAN bus are communicating (can scan other module data)
  • Visually inspect connector and wiring at the camshaft control module for corrosion, bent pins, damage, or water intrusion
  • Check battery voltage and main power fuses/relays for the camshaft module circuit
  • Check for proper module ground(s) at the chassis/powertrain
  • Confirm CAN termination (~60 ohms across CAN_H and CAN_L with ignition off)

Signal parameters

  • CAN bus baud rate: commonly 250 kbps or 500 kbps (varies by vehicle)
  • Idle (recessive) voltages: CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V
  • Dominant state voltages: CAN_H ≈ 3.5 V, CAN_L ≈ 1.5 V (differential ≈ 2.0 V)
  • Expected message rate: camshaft position messages typically tens of Hz (depends on ECU), absence of these messages indicates loss of module transmission
  • Bus resistance (termination): ~60 Ω between CAN_H and CAN_L (two 120 Ω terminators in parallel)

Diagnostic algorithm

  1. Read and record all DTCs and freeze frame data with a capable scan tool; note related U-codes
  2. Attempt to communicate with the camshaft position control module using a scan tool; note timeouts or no response
  3. Perform a visual inspection of the module connector and harness for damage, corrosion, water intrusion; repair as needed
  4. With ignition ON (engine off), backprobe or measure CAN_H and CAN_L at the module connector: verify recessive voltages (~2.5 V) and then check for dominant transitions while cranking or with active data on the bus
  5. Measure resistance across CAN_H to CAN_L at two locations (near module and at gateway): expect ~60 Ω. If open or very low, investigate wiring and terminators
  6. Check module power and ground: verify battery voltage at the module power pins with key ON and verify good chassis/ground continuity
  7. Wiggle test wiring while monitoring communication to reproduce intermittent faults (take care to avoid shorting pins)
  8. If wiring, power, and termination are good and module still does not respond, verify software/ID/configuration requirements (service info) and consider module replacement or reprogramming
  9. Clear codes and retest road/functional test after repairs; if intermittent, consider extended road test or data logger capture

Likely causes

  • Damaged/loose connector or wiring harness to camshaft control module
  • Loss of module ground or fused power feed to the module
  • CAN bus termination or low voltage on CAN_H/CAN_L
  • Failed camshaft position control module
  • Software/configuration mismatch after module replacement

Fault status

⚠️ Status
Lost communication with Camshaft Position Control Module — module not responding or not present on vehicle network.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.5 hours

Similar codes

U0100 U0101 U0102 U0121 U0073
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