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Home / DTC / U0117 — Lost Communication With PTO Control Module

U0117 — Lost Communication With PTO Control Module

Detailed page for trouble code U0117.

33,912codes
59brands
11,451generic
22,461specific
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Code

U0117

Generic U — Network/User

Lost Communication With PTO Control Module

Brand: Generic
Type: U — Network/User
Views: UK: 39 EN: 81 RU: 40
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty PTO control module (internal failure)
  • Open/short in CAN bus wiring to the PTO module
  • Corroded, loose or damaged connector at the PTO module
  • Blown fuse or failed PTO power/ignition relay
  • Low system battery voltage or poor battery connections
  • Faulty gateway/BCM or other network node preventing routing of messages

Symptoms

  • PTO functions inoperative (no engagement or improper operation)
  • PTO indicator or malfunction lamp illuminated on dash
  • Diagnostic scanner cannot communicate with PTO module or reports module not present
  • Other modules report communication errors or multiple U‑codes
  • Intermittent PTO operation or message timeouts

What to check

  • Scan vehicle for all stored, pending and current DTCs and note related U‑codes
  • Confirm battery voltage is within specification (engine off and cranking conditions) and check battery terminals for corrosion/tightness
  • Visually inspect PTO module connector and wiring for corrosion, damage or moisture
  • Check fuses and relays supplying power/ignition to the PTO module
  • Use a scan tool to attempt to communicate with the PTO module; note if the module responds or is listed as "not present"
  • Check for additional network codes that indicate a wider CAN bus problem (U0073, U0100, etc.)

Signal parameters

  • CAN High idle voltage: ~2.5 V (typical range 2.3–2.7 V)
  • CAN Low idle voltage: ~2.5 V (typical range 2.3–2.7 V)
  • Dominant state: CAN_H rises toward ~3.5 V and CAN_L drops toward ~1.5 V (differential ~2.0 V)
  • Bus termination resistance: ~60 ohms measured across CAN_H to CAN_L (two 120 ohm terminators in parallel)
  • Typical CAN data rates: 125 kbps, 250 kbps, or 500 kbps depending on vehicle — confirm correct rate for the network segment
  • Message/frametime: PTO module should periodically transmit its status messages; absence indicates loss of comms

Diagnostic algorithm

  1. Record all related DTCs and freeze frame data; note whether code is current, pending or history
  2. Confirm vehicle power: verify battery voltage and charging system; clean and tighten battery terminals
  3. Check fuses/relays for PTO power and ignition feed; replace if blown or suspect
  4. With ignition ON (engine off), use a scan tool to list modules on the network and attempt to communicate with the PTO module
  5. If the PTO module is not present on the bus, perform visual inspection of the PTO module connector and wiring harness for corrosion, damage or water ingress; repair as needed
  6. Measure CAN_H and CAN_L at the PTO module connector with a multimeter/oscilloscope. Verify idle voltages and that dominant bits appear when other modules communicate
  7. Check termination resistance across CAN_H and CAN_L at a convenient access point; expected ~60 ohms. If open or very low, trace to find missing terminator or short
  8. Perform continuity and short-to-power/ground checks on the CAN pair from the PTO module to the nearest junction or gateway; repair any opens or shorts
  9. Inspect and test ground connections for the PTO module; ensure a clean, low-resistance chassis ground
  10. If wiring and power/ground are good, attempt to power-cycle and then re-scan. If the module intermittently appears, perform wiggle tests to reproduce fault and locate broken conductors
  11. If module hardware is suspected (module never responds and wiring/power/grounds are confirmed good), consult manufacturer service information for replacement and programming/initialization procedures; replace only after verifying module is faulty
  12. Clear codes and test drive or cycle PTO operations to confirm repair. Re-scan for reappearance of U0117 and related codes

Likely causes

  • Corroded/damaged connector at the PTO module or poor grounding
  • Open or shorted CAN bus wires between PTO module and main network
  • Blown fuse or failed PTO power/ignition relay
  • Faulty or unpowered PTO module

Fault status

⚠️ Status
U0117 indicates the vehicle network is not receiving expected communication messages from the PTO control module. The code may be stored as active or history depending on whether the loss of communication is current or intermittent. Check for related network codes and take a systematic approach to verify power, ground, connectors and CAN bus integrity.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.5 hours

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Code

U0117

LAND ROVER U — Network/User

Lost communication with the power take-off control module electric

Brand: LAND ROVER
Type: U — Network/User
Views: UK: 17 EN: 48 RU: 25
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty PTO control module (internal failure)
  • Open/short in CAN bus wiring to the PTO module
  • Corroded, loose or damaged connector at the PTO module
  • Blown fuse or failed PTO power/ignition relay
  • Low system battery voltage or poor battery connections
  • Faulty gateway/BCM or other network node preventing routing of messages

Symptoms

  • PTO functions inoperative (no engagement or improper operation)
  • PTO indicator or malfunction lamp illuminated on dash
  • Diagnostic scanner cannot communicate with PTO module or reports module not present
  • Other modules report communication errors or multiple U‑codes
  • Intermittent PTO operation or message timeouts

What to check

  • Scan vehicle for all stored, pending and current DTCs and note related U‑codes
  • Confirm battery voltage is within specification (engine off and cranking conditions) and check battery terminals for corrosion/tightness
  • Visually inspect PTO module connector and wiring for corrosion, damage or moisture
  • Check fuses and relays supplying power/ignition to the PTO module
  • Use a scan tool to attempt to communicate with the PTO module; note if the module responds or is listed as "not present"
  • Check for additional network codes that indicate a wider CAN bus problem (U0073, U0100, etc.)

Signal parameters

  • CAN High idle voltage: ~2.5 V (typical range 2.3–2.7 V)
  • CAN Low idle voltage: ~2.5 V (typical range 2.3–2.7 V)
  • Dominant state: CAN_H rises toward ~3.5 V and CAN_L drops toward ~1.5 V (differential ~2.0 V)
  • Bus termination resistance: ~60 ohms measured across CAN_H to CAN_L (two 120 ohm terminators in parallel)
  • Typical CAN data rates: 125 kbps, 250 kbps, or 500 kbps depending on vehicle — confirm correct rate for the network segment
  • Message/frametime: PTO module should periodically transmit its status messages; absence indicates loss of comms

Diagnostic algorithm

  1. Record all related DTCs and freeze frame data; note whether code is current, pending or history
  2. Confirm vehicle power: verify battery voltage and charging system; clean and tighten battery terminals
  3. Check fuses/relays for PTO power and ignition feed; replace if blown or suspect
  4. With ignition ON (engine off), use a scan tool to list modules on the network and attempt to communicate with the PTO module
  5. If the PTO module is not present on the bus, perform visual inspection of the PTO module connector and wiring harness for corrosion, damage or water ingress; repair as needed
  6. Measure CAN_H and CAN_L at the PTO module connector with a multimeter/oscilloscope. Verify idle voltages and that dominant bits appear when other modules communicate
  7. Check termination resistance across CAN_H and CAN_L at a convenient access point; expected ~60 ohms. If open or very low, trace to find missing terminator or short
  8. Perform continuity and short-to-power/ground checks on the CAN pair from the PTO module to the nearest junction or gateway; repair any opens or shorts
  9. Inspect and test ground connections for the PTO module; ensure a clean, low-resistance chassis ground
  10. If wiring and power/ground are good, attempt to power-cycle and then re-scan. If the module intermittently appears, perform wiggle tests to reproduce fault and locate broken conductors
  11. If module hardware is suspected (module never responds and wiring/power/grounds are confirmed good), consult manufacturer service information for replacement and programming/initialization procedures; replace only after verifying module is faulty
  12. Clear codes and test drive or cycle PTO operations to confirm repair. Re-scan for reappearance of U0117 and related codes

Likely causes

  • Corroded/damaged connector at the PTO module or poor grounding
  • Open or shorted CAN bus wires between PTO module and main network
  • Blown fuse or failed PTO power/ignition relay
  • Faulty or unpowered PTO module

Fault status

⚠️ Status
U0117 indicates the vehicle network is not receiving expected communication messages from the PTO control module. The code may be stored as active or history depending on whether the loss of communication is current or intermittent. Check for related network codes and take a systematic approach to verify power, ground, connectors and CAN bus integrity.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.5 hours

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U0100 U0073 U0121 U0144 U0122
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