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Home / DTC / U0294 — Lost Communication With Powertrain Control Monitor Module

U0294 — Lost Communication With Powertrain Control Monitor Module

Detailed page for trouble code U0294.

34,405codes
59brands
11,914generic
22,491specific
All codes P-codes (Powertrain) B-codes (Body) C-codes (Chassis) U-codes (Network/User) Tesla Alerts
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Code

U0294

Generic U — Network/User

Lost Communication With Powertrain Control Monitor Module

Brand: Generic
Type: U — Network/User
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or shorted communication bus (CAN high/low) wiring
  • Missing or low module power or ground
  • Corroded, loose or damaged connectors at the module or harness
  • Failed Powertrain Control Monitor Module
  • Missing or failed bus termination resistor(s)
  • Intermittent wiring fault (pinched, rubbed through, water intrusion)

Symptoms

  • Malfunction Indicator Lamp (MIL) or multiple warning lamps illuminated
  • Loss of powertrain-related functions (engine/shift/cruise features may be reduced or inoperative)
  • Other modules reporting the Powertrain Control Monitor as 'missing' or 'not responding' on a scan tool
  • Possible fail-safe or limp-home mode
  • Intermittent operation or stalls if communication periodically drops

What to check

  • Read and record all stored DTCs and freeze frame data from all modules on the network
  • Verify battery voltage is within specification (typically 12.4–14.7 V with engine running)
  • Visually inspect connectors and wiring at the Powertrain Control Monitor and along the CAN bus for damage, corrosion or water
  • Check fuses and relays supplying power to the PCMM
  • Verify module grounds are clean, tight and low resistance
  • Measure CAN bus voltages with a multimeter (CAN_H, CAN_L) and compare to expected values

Signal parameters

  • CAN_H idle voltage: ~2.5–3.5 V (typically ~2.5 V midpoint ±0.5 V depending on vehicle)
  • CAN_L idle voltage: ~1.5–2.5 V (typically ~2.5 V midpoint when passive; differential ~0 V idle)
  • Differential CAN voltage when active: around 1.0–2.5 V depending on protocol
  • Bus termination: ~60 ohms measured across CAN_H and CAN_L (two 120 ohm terminators in parallel)
  • Expected message traffic: periodic frames from powertrain monitor when key on/run (verify with scope or CAN data tool)
  • Module supply voltage: stable battery voltage present at module power pin with key on

Diagnostic algorithm

  1. Connect a scan tool and record U0294 and any other network-related codes; note time stamps and freeze frame data.
  2. Verify battery voltage and charging system health; ensure >12.4 V before full diagnosis.
  3. Inspect connectors and harness at the Powertrain Control Monitor for physical damage, moisture or corrosion. Backprobe pins only when safe and per manufacturer guidance.
  4. Check power and ground circuits at the module: measure for battery voltage on the power input and low resistance to chassis on ground(s). Repair any open/high-resistance circuits.
  5. Check fuses/relays feeding the module and replace if blown or intermittent.
  6. With ignition ON (engine off), measure CAN_H and CAN_L voltages at the module compared to a known-good node. Expect idle midpoint voltages and ~60 ohm across the pair.

Likely causes

  • Damaged CAN H/CAN L wires near common harness points or connectors
  • Module power or ground circuit open or high resistance
  • Poor connector pins (corrosion, bent, pushed out)
  • Failed CAN transceiver inside the PCMM
  • Removed or failed CAN termination resistor (open 60 ohm pair)
  • Aftermarket device or short to other vehicle network causing bus fault

Fault status

⚠️ Status
Lost Communication With Powertrain Control Monitor Module — no response from module on vehicle communication bus.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours
8,338

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Code

U0294

HYUNDAI U — Network/User

Lost Communication With Powertrain Control Monitor Module

Brand: HYUNDAI
Type: U — Network/User
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or shorted communication bus (CAN high/low) wiring
  • Missing or low module power or ground
  • Corroded, loose or damaged connectors at the module or harness
  • Failed Powertrain Control Monitor Module
  • Missing or failed bus termination resistor(s)
  • Intermittent wiring fault (pinched, rubbed through, water intrusion)

Symptoms

  • Malfunction Indicator Lamp (MIL) or multiple warning lamps illuminated
  • Loss of powertrain-related functions (engine/shift/cruise features may be reduced or inoperative)
  • Other modules reporting the Powertrain Control Monitor as 'missing' or 'not responding' on a scan tool
  • Possible fail-safe or limp-home mode
  • Intermittent operation or stalls if communication periodically drops

What to check

  • Read and record all stored DTCs and freeze frame data from all modules on the network
  • Verify battery voltage is within specification (typically 12.4–14.7 V with engine running)
  • Visually inspect connectors and wiring at the Powertrain Control Monitor and along the CAN bus for damage, corrosion or water
  • Check fuses and relays supplying power to the PCMM
  • Verify module grounds are clean, tight and low resistance
  • Measure CAN bus voltages with a multimeter (CAN_H, CAN_L) and compare to expected values

Signal parameters

  • CAN_H idle voltage: ~2.5–3.5 V (typically ~2.5 V midpoint ±0.5 V depending on vehicle)
  • CAN_L idle voltage: ~1.5–2.5 V (typically ~2.5 V midpoint when passive; differential ~0 V idle)
  • Differential CAN voltage when active: around 1.0–2.5 V depending on protocol
  • Bus termination: ~60 ohms measured across CAN_H and CAN_L (two 120 ohm terminators in parallel)
  • Expected message traffic: periodic frames from powertrain monitor when key on/run (verify with scope or CAN data tool)
  • Module supply voltage: stable battery voltage present at module power pin with key on

Diagnostic algorithm

  1. Connect a scan tool and record U0294 and any other network-related codes; note time stamps and freeze frame data.
  2. Verify battery voltage and charging system health; ensure >12.4 V before full diagnosis.
  3. Inspect connectors and harness at the Powertrain Control Monitor for physical damage, moisture or corrosion. Backprobe pins only when safe and per manufacturer guidance.
  4. Check power and ground circuits at the module: measure for battery voltage on the power input and low resistance to chassis on ground(s). Repair any open/high-resistance circuits.
  5. Check fuses/relays feeding the module and replace if blown or intermittent.
  6. With ignition ON (engine off), measure CAN_H and CAN_L voltages at the module compared to a known-good node. Expect idle midpoint voltages and ~60 ohm across the pair.

Likely causes

  • Damaged CAN H/CAN L wires near common harness points or connectors
  • Module power or ground circuit open or high resistance
  • Poor connector pins (corrosion, bent, pushed out)
  • Failed CAN transceiver inside the PCMM
  • Removed or failed CAN termination resistor (open 60 ohm pair)
  • Aftermarket device or short to other vehicle network causing bus fault

Fault status

⚠️ Status
Lost Communication With Powertrain Control Monitor Module — no response from module on vehicle communication bus.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours
371

Browse 371 HYUNDAI manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

HYUNDAI

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Code

U0294

LAND ROVER U — Network/User

Lost communication with the powertrain control module

Brand: LAND ROVER
Type: U — Network/User
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or shorted communication bus (CAN high/low) wiring
  • Missing or low module power or ground
  • Corroded, loose or damaged connectors at the module or harness
  • Failed Powertrain Control Monitor Module
  • Missing or failed bus termination resistor(s)
  • Intermittent wiring fault (pinched, rubbed through, water intrusion)

Symptoms

  • Malfunction Indicator Lamp (MIL) or multiple warning lamps illuminated
  • Loss of powertrain-related functions (engine/shift/cruise features may be reduced or inoperative)
  • Other modules reporting the Powertrain Control Monitor as 'missing' or 'not responding' on a scan tool
  • Possible fail-safe or limp-home mode
  • Intermittent operation or stalls if communication periodically drops

What to check

  • Read and record all stored DTCs and freeze frame data from all modules on the network
  • Verify battery voltage is within specification (typically 12.4–14.7 V with engine running)
  • Visually inspect connectors and wiring at the Powertrain Control Monitor and along the CAN bus for damage, corrosion or water
  • Check fuses and relays supplying power to the PCMM
  • Verify module grounds are clean, tight and low resistance
  • Measure CAN bus voltages with a multimeter (CAN_H, CAN_L) and compare to expected values

Signal parameters

  • CAN_H idle voltage: ~2.5–3.5 V (typically ~2.5 V midpoint ±0.5 V depending on vehicle)
  • CAN_L idle voltage: ~1.5–2.5 V (typically ~2.5 V midpoint when passive; differential ~0 V idle)
  • Differential CAN voltage when active: around 1.0–2.5 V depending on protocol
  • Bus termination: ~60 ohms measured across CAN_H and CAN_L (two 120 ohm terminators in parallel)
  • Expected message traffic: periodic frames from powertrain monitor when key on/run (verify with scope or CAN data tool)
  • Module supply voltage: stable battery voltage present at module power pin with key on

Diagnostic algorithm

  1. Connect a scan tool and record U0294 and any other network-related codes; note time stamps and freeze frame data.
  2. Verify battery voltage and charging system health; ensure >12.4 V before full diagnosis.
  3. Inspect connectors and harness at the Powertrain Control Monitor for physical damage, moisture or corrosion. Backprobe pins only when safe and per manufacturer guidance.
  4. Check power and ground circuits at the module: measure for battery voltage on the power input and low resistance to chassis on ground(s). Repair any open/high-resistance circuits.
  5. Check fuses/relays feeding the module and replace if blown or intermittent.
  6. With ignition ON (engine off), measure CAN_H and CAN_L voltages at the module compared to a known-good node. Expect idle midpoint voltages and ~60 ohm across the pair.

Likely causes

  • Damaged CAN H/CAN L wires near common harness points or connectors
  • Module power or ground circuit open or high resistance
  • Poor connector pins (corrosion, bent, pushed out)
  • Failed CAN transceiver inside the PCMM
  • Removed or failed CAN termination resistor (open 60 ohm pair)
  • Aftermarket device or short to other vehicle network causing bus fault

Fault status

⚠️ Status
Lost Communication With Powertrain Control Monitor Module — no response from module on vehicle communication bus.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours
320

Browse 320 LAND ROVER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

LAND ROVER

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+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
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