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Home / DTC / U1117 — Fault: no communication with the intelligent hydraulic unit ECU: No signal

U1117 — Fault: no communication with the intelligent hydraulic unit ECU: No signal

Detailed page for trouble code U1117.

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U1117

CITROEN U — Network/User

Fault: no communication with the intelligent hydraulic unit ECU: No signal

Brand: CITROEN
Type: U — Network/User
Views: UK: 7 EN: 13 RU: 31
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Blown fuse or loss of power to the IHU ECU
  • Poor or missing ground at the IHU
  • Open, shorted or corroded CAN bus wiring or connectors (CAN High / CAN Low)
  • Damaged/loose connector at the IHU or intermediate junctions
  • Faulty termination resistor (open or wrong resistance)
  • Internal failure of the IHU ECU or software/firmware fault

Symptoms

  • Brake/ABS/ESP/suspension warning lamp(s) on instrument cluster
  • Loss of hydraulic functions (pump/integrated valves not operating)
  • Reduced vehicle stability control or braking assistance, possible limp mode
  • No communication with IHU when using diagnostic tool (scan tool times out)
  • Intermittent or complete failure of associated systems (ABS, active suspension)

What to check

  • Read all U and B codes and freeze frame data with a capable scan tool
  • Attempt to communicate with the IHU ECU via diagnostic tool (confirm no response)
  • Check battery voltage with ignition on and during cranking (
  • Inspect fuses and relays supplying the IHU (replace if blown)
  • Visually inspect IHU connectors and wiring for corrosion, damage, water ingress, pin push-out
  • Measure IHU power pin (12V with ignition/run) and ground continuity

Signal parameters

  • CAN_H idle voltage ≈ 2.5 V (key on)
  • CAN_L idle voltage ≈ 2.5 V (key on)
  • Dominant CAN differential ≈ 2 V during traffic (CAN_H ~3.5 V, CAN_L ~1.5 V)
  • Termination resistance across CAN_H to CAN_L ≈ 58–62 Ω (two 120 Ω in parallel)
  • IHU supply voltage ≈ battery voltage with ignition/run (~12–14 V)
  • Ground resistance to chassis < 0.2 Ω

Diagnostic algorithm

  1. Connect a full-function diagnostic scanner. Record U1117 and any related codes; note freeze frame and occurrence conditions.
  2. Attempt to communicate with the IHU ECU. Confirm no response from the module while other modules respond.
  3. Check vehicle battery voltage and health; charge or replace if below spec. Re-test communication.
  4. Inspect fuses/relays for the hydraulic unit circuit; replace any blown fuses and retest.
  5. Visually inspect IHU connector boots for moisture or corrosion; disconnect and inspect pins for damage or corrosion.
  6. Verify power and ground at the IHU connector: measure for battery voltage on supply pin with ignition on and measure ground continuity to chassis.
  7. With connector connected, measure CAN_H and CAN_L voltages at the IHU pins. Compare to signal_params. If voltages abnormal, trace wiring for short/open.
  8. Check CAN termination resistance (engine off). If open or out of range, locate/repair termination resistors or damaged wires.
  9. Probe CAN bus with oscilloscope or CAN sniffer to check for valid traffic and to see whether the IHU ever transmits. Look for bus errors or collisions.
  10. If wiring, power and ground are good and bus traffic is present but IHU does not respond, consider ECU internal fault. Check for available software updates or reflash procedures before replacement.
  11. After repairs or module replacement, clear codes, perform relearn or coding if required, and road test to confirm fault does not return.

Likely causes

  • Power/ground supply problem at the IHU (fuse, connector, wiring)
  • CAN bus wiring fault near the IHU (open, short to power/ground, or high resistance)
  • Corroded or poorly seated connector at the IHU
  • Failed IHU ECU (after verifying wiring and power)
  • Missing termination or multiple termination faults on CAN

Fault status

⚠️ Status
No communication with Intelligent Hydraulic Unit (IHU) ECU — no signal on CAN bus
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.5 - 3.0 hours

Similar codes

U0100 U0121 U0155 U1277 U1110
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Code

U1117

DS U — Network/User

Fault: no communication with the intelligent hydraulic unit ECU: No signal

Brand: DS
Type: U — Network/User
Views: UK: 9 EN: 10 RU: 22
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Blown fuse or loss of power to the IHU ECU
  • Poor or missing ground at the IHU
  • Open, shorted or corroded CAN bus wiring or connectors (CAN High / CAN Low)
  • Damaged/loose connector at the IHU or intermediate junctions
  • Faulty termination resistor (open or wrong resistance)
  • Internal failure of the IHU ECU or software/firmware fault

Symptoms

  • Brake/ABS/ESP/suspension warning lamp(s) on instrument cluster
  • Loss of hydraulic functions (pump/integrated valves not operating)
  • Reduced vehicle stability control or braking assistance, possible limp mode
  • No communication with IHU when using diagnostic tool (scan tool times out)
  • Intermittent or complete failure of associated systems (ABS, active suspension)

What to check

  • Read all U and B codes and freeze frame data with a capable scan tool
  • Attempt to communicate with the IHU ECU via diagnostic tool (confirm no response)
  • Check battery voltage with ignition on and during cranking (
  • Inspect fuses and relays supplying the IHU (replace if blown)
  • Visually inspect IHU connectors and wiring for corrosion, damage, water ingress, pin push-out
  • Measure IHU power pin (12V with ignition/run) and ground continuity

Signal parameters

  • CAN_H idle voltage ≈ 2.5 V (key on)
  • CAN_L idle voltage ≈ 2.5 V (key on)
  • Dominant CAN differential ≈ 2 V during traffic (CAN_H ~3.5 V, CAN_L ~1.5 V)
  • Termination resistance across CAN_H to CAN_L ≈ 58–62 Ω (two 120 Ω in parallel)
  • IHU supply voltage ≈ battery voltage with ignition/run (~12–14 V)
  • Ground resistance to chassis < 0.2 Ω

Diagnostic algorithm

  1. Connect a full-function diagnostic scanner. Record U1117 and any related codes; note freeze frame and occurrence conditions.
  2. Attempt to communicate with the IHU ECU. Confirm no response from the module while other modules respond.
  3. Check vehicle battery voltage and health; charge or replace if below spec. Re-test communication.
  4. Inspect fuses/relays for the hydraulic unit circuit; replace any blown fuses and retest.
  5. Visually inspect IHU connector boots for moisture or corrosion; disconnect and inspect pins for damage or corrosion.
  6. Verify power and ground at the IHU connector: measure for battery voltage on supply pin with ignition on and measure ground continuity to chassis.
  7. With connector connected, measure CAN_H and CAN_L voltages at the IHU pins. Compare to signal_params. If voltages abnormal, trace wiring for short/open.
  8. Check CAN termination resistance (engine off). If open or out of range, locate/repair termination resistors or damaged wires.
  9. Probe CAN bus with oscilloscope or CAN sniffer to check for valid traffic and to see whether the IHU ever transmits. Look for bus errors or collisions.
  10. If wiring, power and ground are good and bus traffic is present but IHU does not respond, consider ECU internal fault. Check for available software updates or reflash procedures before replacement.
  11. After repairs or module replacement, clear codes, perform relearn or coding if required, and road test to confirm fault does not return.

Likely causes

  • Power/ground supply problem at the IHU (fuse, connector, wiring)
  • CAN bus wiring fault near the IHU (open, short to power/ground, or high resistance)
  • Corroded or poorly seated connector at the IHU
  • Failed IHU ECU (after verifying wiring and power)
  • Missing termination or multiple termination faults on CAN

Fault status

⚠️ Status
No communication with Intelligent Hydraulic Unit (IHU) ECU — no signal on CAN bus
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.5 - 3.0 hours

Similar codes

U0100 U0121 U0155 U1277 U1110
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+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

U1117

HYUNDAI U — Network/User

High Speed CAN2 Communication (EMS-DCT)

Brand: HYUNDAI
Type: U — Network/User
Views: UK: 13 EN: 21 RU: 31
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Blown fuse or loss of power to the IHU ECU
  • Poor or missing ground at the IHU
  • Open, shorted or corroded CAN bus wiring or connectors (CAN High / CAN Low)
  • Damaged/loose connector at the IHU or intermediate junctions
  • Faulty termination resistor (open or wrong resistance)
  • Internal failure of the IHU ECU or software/firmware fault

Symptoms

  • Brake/ABS/ESP/suspension warning lamp(s) on instrument cluster
  • Loss of hydraulic functions (pump/integrated valves not operating)
  • Reduced vehicle stability control or braking assistance, possible limp mode
  • No communication with IHU when using diagnostic tool (scan tool times out)
  • Intermittent or complete failure of associated systems (ABS, active suspension)

What to check

  • Read all U and B codes and freeze frame data with a capable scan tool
  • Attempt to communicate with the IHU ECU via diagnostic tool (confirm no response)
  • Check battery voltage with ignition on and during cranking (
  • Inspect fuses and relays supplying the IHU (replace if blown)
  • Visually inspect IHU connectors and wiring for corrosion, damage, water ingress, pin push-out
  • Measure IHU power pin (12V with ignition/run) and ground continuity

Signal parameters

  • CAN_H idle voltage ≈ 2.5 V (key on)
  • CAN_L idle voltage ≈ 2.5 V (key on)
  • Dominant CAN differential ≈ 2 V during traffic (CAN_H ~3.5 V, CAN_L ~1.5 V)
  • Termination resistance across CAN_H to CAN_L ≈ 58–62 Ω (two 120 Ω in parallel)
  • IHU supply voltage ≈ battery voltage with ignition/run (~12–14 V)
  • Ground resistance to chassis < 0.2 Ω

Diagnostic algorithm

  1. Connect a full-function diagnostic scanner. Record U1117 and any related codes; note freeze frame and occurrence conditions.
  2. Attempt to communicate with the IHU ECU. Confirm no response from the module while other modules respond.
  3. Check vehicle battery voltage and health; charge or replace if below spec. Re-test communication.
  4. Inspect fuses/relays for the hydraulic unit circuit; replace any blown fuses and retest.
  5. Visually inspect IHU connector boots for moisture or corrosion; disconnect and inspect pins for damage or corrosion.
  6. Verify power and ground at the IHU connector: measure for battery voltage on supply pin with ignition on and measure ground continuity to chassis.
  7. With connector connected, measure CAN_H and CAN_L voltages at the IHU pins. Compare to signal_params. If voltages abnormal, trace wiring for short/open.
  8. Check CAN termination resistance (engine off). If open or out of range, locate/repair termination resistors or damaged wires.
  9. Probe CAN bus with oscilloscope or CAN sniffer to check for valid traffic and to see whether the IHU ever transmits. Look for bus errors or collisions.
  10. If wiring, power and ground are good and bus traffic is present but IHU does not respond, consider ECU internal fault. Check for available software updates or reflash procedures before replacement.
  11. After repairs or module replacement, clear codes, perform relearn or coding if required, and road test to confirm fault does not return.

Likely causes

  • Power/ground supply problem at the IHU (fuse, connector, wiring)
  • CAN bus wiring fault near the IHU (open, short to power/ground, or high resistance)
  • Corroded or poorly seated connector at the IHU
  • Failed IHU ECU (after verifying wiring and power)
  • Missing termination or multiple termination faults on CAN

Fault status

⚠️ Status
No communication with Intelligent Hydraulic Unit (IHU) ECU — no signal on CAN bus
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.5 - 3.0 hours

Similar codes

U0100 U0121 U0155 U1277 U1110
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

U1117

MITSUBISHI U — Network/User

IMMOB.CAN timeout/Not equipped

Brand: MITSUBISHI
Type: U — Network/User
Views: UK: 12 EN: 19 RU: 31
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Blown fuse or loss of power to the IHU ECU
  • Poor or missing ground at the IHU
  • Open, shorted or corroded CAN bus wiring or connectors (CAN High / CAN Low)
  • Damaged/loose connector at the IHU or intermediate junctions
  • Faulty termination resistor (open or wrong resistance)
  • Internal failure of the IHU ECU or software/firmware fault

Symptoms

  • Brake/ABS/ESP/suspension warning lamp(s) on instrument cluster
  • Loss of hydraulic functions (pump/integrated valves not operating)
  • Reduced vehicle stability control or braking assistance, possible limp mode
  • No communication with IHU when using diagnostic tool (scan tool times out)
  • Intermittent or complete failure of associated systems (ABS, active suspension)

What to check

  • Read all U and B codes and freeze frame data with a capable scan tool
  • Attempt to communicate with the IHU ECU via diagnostic tool (confirm no response)
  • Check battery voltage with ignition on and during cranking (
  • Inspect fuses and relays supplying the IHU (replace if blown)
  • Visually inspect IHU connectors and wiring for corrosion, damage, water ingress, pin push-out
  • Measure IHU power pin (12V with ignition/run) and ground continuity

Signal parameters

  • CAN_H idle voltage ≈ 2.5 V (key on)
  • CAN_L idle voltage ≈ 2.5 V (key on)
  • Dominant CAN differential ≈ 2 V during traffic (CAN_H ~3.5 V, CAN_L ~1.5 V)
  • Termination resistance across CAN_H to CAN_L ≈ 58–62 Ω (two 120 Ω in parallel)
  • IHU supply voltage ≈ battery voltage with ignition/run (~12–14 V)
  • Ground resistance to chassis < 0.2 Ω

Diagnostic algorithm

  1. Connect a full-function diagnostic scanner. Record U1117 and any related codes; note freeze frame and occurrence conditions.
  2. Attempt to communicate with the IHU ECU. Confirm no response from the module while other modules respond.
  3. Check vehicle battery voltage and health; charge or replace if below spec. Re-test communication.
  4. Inspect fuses/relays for the hydraulic unit circuit; replace any blown fuses and retest.
  5. Visually inspect IHU connector boots for moisture or corrosion; disconnect and inspect pins for damage or corrosion.
  6. Verify power and ground at the IHU connector: measure for battery voltage on supply pin with ignition on and measure ground continuity to chassis.
  7. With connector connected, measure CAN_H and CAN_L voltages at the IHU pins. Compare to signal_params. If voltages abnormal, trace wiring for short/open.
  8. Check CAN termination resistance (engine off). If open or out of range, locate/repair termination resistors or damaged wires.
  9. Probe CAN bus with oscilloscope or CAN sniffer to check for valid traffic and to see whether the IHU ever transmits. Look for bus errors or collisions.
  10. If wiring, power and ground are good and bus traffic is present but IHU does not respond, consider ECU internal fault. Check for available software updates or reflash procedures before replacement.
  11. After repairs or module replacement, clear codes, perform relearn or coding if required, and road test to confirm fault does not return.

Likely causes

  • Power/ground supply problem at the IHU (fuse, connector, wiring)
  • CAN bus wiring fault near the IHU (open, short to power/ground, or high resistance)
  • Corroded or poorly seated connector at the IHU
  • Failed IHU ECU (after verifying wiring and power)
  • Missing termination or multiple termination faults on CAN

Fault status

⚠️ Status
No communication with Intelligent Hydraulic Unit (IHU) ECU — no signal on CAN bus
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.5 - 3.0 hours

Similar codes

U0100 U0121 U0155 U1277 U1110
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

U1117

Other U — Network/User

SCP (J1850) Invalid or Missing Data for Electrical Energy Management

Brand: Other
Type: U — Network/User
Views: UK: 26 EN: 26 RU: 41
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Blown fuse or loss of power to the IHU ECU
  • Poor or missing ground at the IHU
  • Open, shorted or corroded CAN bus wiring or connectors (CAN High / CAN Low)
  • Damaged/loose connector at the IHU or intermediate junctions
  • Faulty termination resistor (open or wrong resistance)
  • Internal failure of the IHU ECU or software/firmware fault

Symptoms

  • Brake/ABS/ESP/suspension warning lamp(s) on instrument cluster
  • Loss of hydraulic functions (pump/integrated valves not operating)
  • Reduced vehicle stability control or braking assistance, possible limp mode
  • No communication with IHU when using diagnostic tool (scan tool times out)
  • Intermittent or complete failure of associated systems (ABS, active suspension)

What to check

  • Read all U and B codes and freeze frame data with a capable scan tool
  • Attempt to communicate with the IHU ECU via diagnostic tool (confirm no response)
  • Check battery voltage with ignition on and during cranking (
  • Inspect fuses and relays supplying the IHU (replace if blown)
  • Visually inspect IHU connectors and wiring for corrosion, damage, water ingress, pin push-out
  • Measure IHU power pin (12V with ignition/run) and ground continuity

Signal parameters

  • CAN_H idle voltage ≈ 2.5 V (key on)
  • CAN_L idle voltage ≈ 2.5 V (key on)
  • Dominant CAN differential ≈ 2 V during traffic (CAN_H ~3.5 V, CAN_L ~1.5 V)
  • Termination resistance across CAN_H to CAN_L ≈ 58–62 Ω (two 120 Ω in parallel)
  • IHU supply voltage ≈ battery voltage with ignition/run (~12–14 V)
  • Ground resistance to chassis < 0.2 Ω

Diagnostic algorithm

  1. Connect a full-function diagnostic scanner. Record U1117 and any related codes; note freeze frame and occurrence conditions.
  2. Attempt to communicate with the IHU ECU. Confirm no response from the module while other modules respond.
  3. Check vehicle battery voltage and health; charge or replace if below spec. Re-test communication.
  4. Inspect fuses/relays for the hydraulic unit circuit; replace any blown fuses and retest.
  5. Visually inspect IHU connector boots for moisture or corrosion; disconnect and inspect pins for damage or corrosion.
  6. Verify power and ground at the IHU connector: measure for battery voltage on supply pin with ignition on and measure ground continuity to chassis.
  7. With connector connected, measure CAN_H and CAN_L voltages at the IHU pins. Compare to signal_params. If voltages abnormal, trace wiring for short/open.
  8. Check CAN termination resistance (engine off). If open or out of range, locate/repair termination resistors or damaged wires.
  9. Probe CAN bus with oscilloscope or CAN sniffer to check for valid traffic and to see whether the IHU ever transmits. Look for bus errors or collisions.
  10. If wiring, power and ground are good and bus traffic is present but IHU does not respond, consider ECU internal fault. Check for available software updates or reflash procedures before replacement.
  11. After repairs or module replacement, clear codes, perform relearn or coding if required, and road test to confirm fault does not return.

Likely causes

  • Power/ground supply problem at the IHU (fuse, connector, wiring)
  • CAN bus wiring fault near the IHU (open, short to power/ground, or high resistance)
  • Corroded or poorly seated connector at the IHU
  • Failed IHU ECU (after verifying wiring and power)
  • Missing termination or multiple termination faults on CAN

Fault status

⚠️ Status
No communication with Intelligent Hydraulic Unit (IHU) ECU — no signal on CAN bus
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.5 - 3.0 hours

Similar codes

U0100 U0121 U0155 U1277 U1110
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Code

U1117

PEUGEOT U — Network/User

Fault: no communication with the intelligent hydraulic unit ECU: No signal

Brand: PEUGEOT
Type: U — Network/User
Views: UK: 8 EN: 10 RU: 25
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Blown fuse or loss of power to the IHU ECU
  • Poor or missing ground at the IHU
  • Open, shorted or corroded CAN bus wiring or connectors (CAN High / CAN Low)
  • Damaged/loose connector at the IHU or intermediate junctions
  • Faulty termination resistor (open or wrong resistance)
  • Internal failure of the IHU ECU or software/firmware fault

Symptoms

  • Brake/ABS/ESP/suspension warning lamp(s) on instrument cluster
  • Loss of hydraulic functions (pump/integrated valves not operating)
  • Reduced vehicle stability control or braking assistance, possible limp mode
  • No communication with IHU when using diagnostic tool (scan tool times out)
  • Intermittent or complete failure of associated systems (ABS, active suspension)

What to check

  • Read all U and B codes and freeze frame data with a capable scan tool
  • Attempt to communicate with the IHU ECU via diagnostic tool (confirm no response)
  • Check battery voltage with ignition on and during cranking (
  • Inspect fuses and relays supplying the IHU (replace if blown)
  • Visually inspect IHU connectors and wiring for corrosion, damage, water ingress, pin push-out
  • Measure IHU power pin (12V with ignition/run) and ground continuity

Signal parameters

  • CAN_H idle voltage ≈ 2.5 V (key on)
  • CAN_L idle voltage ≈ 2.5 V (key on)
  • Dominant CAN differential ≈ 2 V during traffic (CAN_H ~3.5 V, CAN_L ~1.5 V)
  • Termination resistance across CAN_H to CAN_L ≈ 58–62 Ω (two 120 Ω in parallel)
  • IHU supply voltage ≈ battery voltage with ignition/run (~12–14 V)
  • Ground resistance to chassis < 0.2 Ω

Diagnostic algorithm

  1. Connect a full-function diagnostic scanner. Record U1117 and any related codes; note freeze frame and occurrence conditions.
  2. Attempt to communicate with the IHU ECU. Confirm no response from the module while other modules respond.
  3. Check vehicle battery voltage and health; charge or replace if below spec. Re-test communication.
  4. Inspect fuses/relays for the hydraulic unit circuit; replace any blown fuses and retest.
  5. Visually inspect IHU connector boots for moisture or corrosion; disconnect and inspect pins for damage or corrosion.
  6. Verify power and ground at the IHU connector: measure for battery voltage on supply pin with ignition on and measure ground continuity to chassis.
  7. With connector connected, measure CAN_H and CAN_L voltages at the IHU pins. Compare to signal_params. If voltages abnormal, trace wiring for short/open.
  8. Check CAN termination resistance (engine off). If open or out of range, locate/repair termination resistors or damaged wires.
  9. Probe CAN bus with oscilloscope or CAN sniffer to check for valid traffic and to see whether the IHU ever transmits. Look for bus errors or collisions.
  10. If wiring, power and ground are good and bus traffic is present but IHU does not respond, consider ECU internal fault. Check for available software updates or reflash procedures before replacement.
  11. After repairs or module replacement, clear codes, perform relearn or coding if required, and road test to confirm fault does not return.

Likely causes

  • Power/ground supply problem at the IHU (fuse, connector, wiring)
  • CAN bus wiring fault near the IHU (open, short to power/ground, or high resistance)
  • Corroded or poorly seated connector at the IHU
  • Failed IHU ECU (after verifying wiring and power)
  • Missing termination or multiple termination faults on CAN

Fault status

⚠️ Status
No communication with Intelligent Hydraulic Unit (IHU) ECU — no signal on CAN bus
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.5 - 3.0 hours

Similar codes

U0100 U0121 U0155 U1277 U1110
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