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Home / DTC / U1121 — Lost Communication With Electric Stability Program Module

U1121 — Lost Communication With Electric Stability Program Module

Detailed page for trouble code U1121.

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Code

U1121

HYUNDAI U — Network/User

Lost Communication With Electric Stability Program Module

Brand: HYUNDAI
Type: U — Network/User
Views: UK: 10 EN: 17 RU: 14
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or short in CAN bus wiring (CAN High / CAN Low) to/from ESP module
  • Poor or corroded connector or pin at ESP module
  • Loss of module power (fuse, relay, wiring) or bad ground
  • Failed ESP module or internal electronics
  • Bus termination resistor missing or shorted
  • Software mismatch, corrupted calibration, or module asleep/not initialized

Symptoms

  • ESP / ESC / Traction Control warning lamp illuminated
  • ABS warning lamp may also be on
  • Loss of vehicle stability/traction control functions
  • Related features degraded or disabled (e.g., hill-start assist, traction control)
  • Scan tool shows no response or intermittent response from ESP module
  • Multiple network communication fault codes present

What to check

  • Connect a diagnostic scan tool and record U1121 plus any other U-codes; attempt to communicate with ESP module
  • Check battery voltage with key ON and engine OFF (should be stable ~12V+); verify charging system during cranking/running
  • Inspect fuses and relays that supply the ESP/ABS module
  • Visually inspect ESP connector and wiring harness for damage, corrosion, bent pins or moisture
  • Measure supply voltage and ground at the ESP module connector with harness connected
  • Measure CANH and CANL voltages (key ON, engine OFF) and compare to expected idle voltage (~2.5 V each) and differential

Signal parameters

  • CAN bus idle voltage: CANH ≈ 2.5 V, CANL ≈ 2.5 V (each referenced to chassis ground)
  • CAN differential idle: ≈ 0 V; dominant state differential typically ≈ 1.5–3.5 V
  • Termination resistance: approx. 60 Ω across CANH–CANL (two 120 Ω terminators in parallel)
  • Typical CAN speeds used on chassis: 500 kbps (high speed) or 250 kbps (lower speed) — verify vehicle spec
  • Module supply: battery voltage at module connector with key ON (typically ~12 V)
  • Ground resistance: low (near 0 Ω) between module ground terminal and chassis ground

Diagnostic algorithm

  1. Record freeze frame and all stored codes; note if faults are permanent or intermittent.
  2. Attempt to communicate with the ESP module using a factory-level scan tool; note response or lack thereof.
  3. Check battery voltage and condition; ensure adequate system voltage during diagnosis (≥11.5 V).
  4. Inspect and reseat the ESP module connector; check for corrosion, bent pins or moisture. Repair or clean as needed.
  5. Verify fuses/relays powering the ESP module and replace if blown or intermittent.
  6. With ignition ON, measure supply voltage and ground at the ESP connector to confirm proper power and earth.
  7. Measure CANH and CANL voltages at the ESP connector. If either line is shorted to battery or ground, trace and repair.
  8. With ignition OFF, measure resistance across CANH–CANL; expect ~60 Ω. If outside range, locate missing/shorted terminator.
  9. If physical wiring and power are OK, isolate the ESP module by disconnecting it and checking whether bus communication to other modules returns to normal.
  10. If bus is healthy and only the ESP module fails to respond, consider module fault — check for available software updates or reprogramming before replacement.
  11. After repairs, clear codes, perform relearn or initialization procedures required by manufacturer, then road‑test and re-scan for recurrence.

Likely causes

  • Loose/corroded connector at the ESP module
  • Blown fuse or failed relay supplying module 12V
  • Broken or shorted CANH/CANL wiring between ABS/ESP and main CAN
  • Failed ESP control unit
  • Missing/failed CAN termination resistor (≈60 Ω across CANH–CANL)

Fault status

⚠️ Status
Lost Communication With Electric Stability Program (ESP) Module (U1121)
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0 - 3.0 hours

Similar codes

U0100 U0121 U0140 U1110 U0122
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Code

U1121

MITSUBISHI U — Network/User

T/M(CAN message)

Brand: MITSUBISHI
Type: U — Network/User
Views: UK: 12 EN: 17 RU: 15
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or short in CAN bus wiring (CAN High / CAN Low) to/from ESP module
  • Poor or corroded connector or pin at ESP module
  • Loss of module power (fuse, relay, wiring) or bad ground
  • Failed ESP module or internal electronics
  • Bus termination resistor missing or shorted
  • Software mismatch, corrupted calibration, or module asleep/not initialized

Symptoms

  • ESP / ESC / Traction Control warning lamp illuminated
  • ABS warning lamp may also be on
  • Loss of vehicle stability/traction control functions
  • Related features degraded or disabled (e.g., hill-start assist, traction control)
  • Scan tool shows no response or intermittent response from ESP module
  • Multiple network communication fault codes present

What to check

  • Connect a diagnostic scan tool and record U1121 plus any other U-codes; attempt to communicate with ESP module
  • Check battery voltage with key ON and engine OFF (should be stable ~12V+); verify charging system during cranking/running
  • Inspect fuses and relays that supply the ESP/ABS module
  • Visually inspect ESP connector and wiring harness for damage, corrosion, bent pins or moisture
  • Measure supply voltage and ground at the ESP module connector with harness connected
  • Measure CANH and CANL voltages (key ON, engine OFF) and compare to expected idle voltage (~2.5 V each) and differential

Signal parameters

  • CAN bus idle voltage: CANH ≈ 2.5 V, CANL ≈ 2.5 V (each referenced to chassis ground)
  • CAN differential idle: ≈ 0 V; dominant state differential typically ≈ 1.5–3.5 V
  • Termination resistance: approx. 60 Ω across CANH–CANL (two 120 Ω terminators in parallel)
  • Typical CAN speeds used on chassis: 500 kbps (high speed) or 250 kbps (lower speed) — verify vehicle spec
  • Module supply: battery voltage at module connector with key ON (typically ~12 V)
  • Ground resistance: low (near 0 Ω) between module ground terminal and chassis ground

Diagnostic algorithm

  1. Record freeze frame and all stored codes; note if faults are permanent or intermittent.
  2. Attempt to communicate with the ESP module using a factory-level scan tool; note response or lack thereof.
  3. Check battery voltage and condition; ensure adequate system voltage during diagnosis (≥11.5 V).
  4. Inspect and reseat the ESP module connector; check for corrosion, bent pins or moisture. Repair or clean as needed.
  5. Verify fuses/relays powering the ESP module and replace if blown or intermittent.
  6. With ignition ON, measure supply voltage and ground at the ESP connector to confirm proper power and earth.
  7. Measure CANH and CANL voltages at the ESP connector. If either line is shorted to battery or ground, trace and repair.
  8. With ignition OFF, measure resistance across CANH–CANL; expect ~60 Ω. If outside range, locate missing/shorted terminator.
  9. If physical wiring and power are OK, isolate the ESP module by disconnecting it and checking whether bus communication to other modules returns to normal.
  10. If bus is healthy and only the ESP module fails to respond, consider module fault — check for available software updates or reprogramming before replacement.
  11. After repairs, clear codes, perform relearn or initialization procedures required by manufacturer, then road‑test and re-scan for recurrence.

Likely causes

  • Loose/corroded connector at the ESP module
  • Blown fuse or failed relay supplying module 12V
  • Broken or shorted CANH/CANL wiring between ABS/ESP and main CAN
  • Failed ESP control unit
  • Missing/failed CAN termination resistor (≈60 Ω across CANH–CANL)

Fault status

⚠️ Status
Lost Communication With Electric Stability Program (ESP) Module (U1121)
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0 - 3.0 hours

Similar codes

U0100 U0121 U0140 U1110 U0122
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

U1121

Other U — Network/User

SCP (J1850) Invalid or Missing Data for Primary Id

Brand: Other
Type: U — Network/User
Views: UK: 21 EN: 29 RU: 25
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or short in CAN bus wiring (CAN High / CAN Low) to/from ESP module
  • Poor or corroded connector or pin at ESP module
  • Loss of module power (fuse, relay, wiring) or bad ground
  • Failed ESP module or internal electronics
  • Bus termination resistor missing or shorted
  • Software mismatch, corrupted calibration, or module asleep/not initialized

Symptoms

  • ESP / ESC / Traction Control warning lamp illuminated
  • ABS warning lamp may also be on
  • Loss of vehicle stability/traction control functions
  • Related features degraded or disabled (e.g., hill-start assist, traction control)
  • Scan tool shows no response or intermittent response from ESP module
  • Multiple network communication fault codes present

What to check

  • Connect a diagnostic scan tool and record U1121 plus any other U-codes; attempt to communicate with ESP module
  • Check battery voltage with key ON and engine OFF (should be stable ~12V+); verify charging system during cranking/running
  • Inspect fuses and relays that supply the ESP/ABS module
  • Visually inspect ESP connector and wiring harness for damage, corrosion, bent pins or moisture
  • Measure supply voltage and ground at the ESP module connector with harness connected
  • Measure CANH and CANL voltages (key ON, engine OFF) and compare to expected idle voltage (~2.5 V each) and differential

Signal parameters

  • CAN bus idle voltage: CANH ≈ 2.5 V, CANL ≈ 2.5 V (each referenced to chassis ground)
  • CAN differential idle: ≈ 0 V; dominant state differential typically ≈ 1.5–3.5 V
  • Termination resistance: approx. 60 Ω across CANH–CANL (two 120 Ω terminators in parallel)
  • Typical CAN speeds used on chassis: 500 kbps (high speed) or 250 kbps (lower speed) — verify vehicle spec
  • Module supply: battery voltage at module connector with key ON (typically ~12 V)
  • Ground resistance: low (near 0 Ω) between module ground terminal and chassis ground

Diagnostic algorithm

  1. Record freeze frame and all stored codes; note if faults are permanent or intermittent.
  2. Attempt to communicate with the ESP module using a factory-level scan tool; note response or lack thereof.
  3. Check battery voltage and condition; ensure adequate system voltage during diagnosis (≥11.5 V).
  4. Inspect and reseat the ESP module connector; check for corrosion, bent pins or moisture. Repair or clean as needed.
  5. Verify fuses/relays powering the ESP module and replace if blown or intermittent.
  6. With ignition ON, measure supply voltage and ground at the ESP connector to confirm proper power and earth.
  7. Measure CANH and CANL voltages at the ESP connector. If either line is shorted to battery or ground, trace and repair.
  8. With ignition OFF, measure resistance across CANH–CANL; expect ~60 Ω. If outside range, locate missing/shorted terminator.
  9. If physical wiring and power are OK, isolate the ESP module by disconnecting it and checking whether bus communication to other modules returns to normal.
  10. If bus is healthy and only the ESP module fails to respond, consider module fault — check for available software updates or reprogramming before replacement.
  11. After repairs, clear codes, perform relearn or initialization procedures required by manufacturer, then road‑test and re-scan for recurrence.

Likely causes

  • Loose/corroded connector at the ESP module
  • Blown fuse or failed relay supplying module 12V
  • Broken or shorted CANH/CANL wiring between ABS/ESP and main CAN
  • Failed ESP control unit
  • Missing/failed CAN termination resistor (≈60 Ω across CANH–CANL)

Fault status

⚠️ Status
Lost Communication With Electric Stability Program (ESP) Module (U1121)
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0 - 3.0 hours

Similar codes

U0100 U0121 U0140 U1110 U0122
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