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Home / DTC / C1102 — Battery Voltage-Low | Battery Voltage Low | ESP2 message timeout

C1102 — Battery Voltage-Low | Battery Voltage Low | ESP2 message timeout

Detailed page for trouble code C1102.

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C1102

HYUNDAI C — Chassis

Battery Voltage-Low | Battery Voltage Low | ESP2 message timeout

Brand: HYUNDAI
Type: C — Chassis
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Weak, discharged or failing battery
  • Poor battery terminal or cable connection (corrosion, loose)
  • Faulty or underperforming charging system (alternator, regulator)
  • Blown fuse, fusible link or relay supplying ESP/BCM
  • Bad ground connection between chassis/battery and modules
  • Damaged wiring or connectors on CAN bus between ESP/ABS and other modules

Symptoms

  • ESP/ESC, ABS or traction warning lamp illuminated
  • Intermittent or permanent loss of ESP/ABS functionality
  • Possible engine warning or limp-home behavior if other modules affected
  • Stored/continuously recurring C1102 code
  • Electrical symptoms: dimming lights, low accessory performance

What to check

  • Read all stored codes and freeze frame data with a full-function scanner; record related U/C codes
  • Measure battery open-circuit/resting voltage (with vehicle off)
  • Measure battery voltage during cranking and with engine running (charging voltage)
  • Perform a battery load test or check battery state-of-health (SLA/AGM-specific tests)
  • Visually inspect and clean battery terminals, cable ends and engine/chassis grounds
  • Inspect fuses and relays supplying BCM/ESP/ABS and replace if suspect

Signal parameters

  • Battery resting voltage: ~12.4–12.7 V (healthy); values < 12.0 V indicate discharged/weak battery
  • Cranking voltage: should generally stay above ~9.5 V (very low during severe cranking indicates weak battery)
  • Charging voltage (engine running): nominal 13.5–14.8 V (depends on vehicle charging specs)
  • ESP2/CAN message: periodic CAN frames expected from ESP/ABS node; absence for defined timeout triggers code
  • CAN bus idle voltages: CAN_H ~2.5–3.5 V, CAN_L ~1.5–2.5 V (use scope or CAN analyzer to confirm activity and differential)
  • Module supply pin at ESP/ABS: should match battery/ignition feed when key ON (no large drops under load)

Diagnostic algorithm

  1. Retrieve all DTCs and freeze frame; note related U/C codes and clear codes to see if C1102 returns.
  2. Visually inspect battery, terminals, cables, and main grounds. Clean and tighten battery connections.
  3. Measure and record battery voltage (key off), cranking voltage, and charging voltage (engine running).
  4. Perform battery load test or use battery tester to confirm battery capacity/health; replace battery if failing.
  5. Inspect and test alternator output and regulator if charging voltage out of range; repair charging system as needed.
  6. Check fuses/relays and wiring that supply the ESP/ABS and BCM for damage or open circuits; repair as required.
  7. Backprobe/measure voltage at the ESP/ABS module power and ground pins while cycling ignition to confirm stable supply.
  8. Use a scan tool or CAN bus analyzer to verify ESP2 messages are present; if messages missing, trace CAN wiring between nodes and repair shorts/opens or corrosion.
  9. If wiring and power are good but intermittent or permanent loss persists, consider module reprogramming or replacement per OEM procedure.
  10. After repairs, clear DTCs, test-drive and re-scan to confirm C1102 does not return and system operates normally.

Likely causes

  • Battery state-of-charge too low or battery failing (most likely)
  • Loose/corroded battery terminals or negative ground
  • Charging voltage below normal (alternator/regulator issue)
  • Faulty/loose connector at ESP/ABS module or BCM
  • CAN bus wiring fault between ESP2 and network nodes

Fault status

⚠️ Status
Battery voltage below acceptable threshold and/or ESP2 CAN messages not received (ESP/ABS communication timeout). Stability control may be disabled.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0 - 2.5 hours

Similar codes

C1100 C1101 U0100 U0121 U0073 P0562
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

C1102

MERCEDES-BENZ C — Chassis

ETS/ASR, ABS Left Axle VSS Circuit Fault

Brand: MERCEDES-BENZ
Type: C — Chassis
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Weak, discharged or failing battery
  • Poor battery terminal or cable connection (corrosion, loose)
  • Faulty or underperforming charging system (alternator, regulator)
  • Blown fuse, fusible link or relay supplying ESP/BCM
  • Bad ground connection between chassis/battery and modules
  • Damaged wiring or connectors on CAN bus between ESP/ABS and other modules

Symptoms

  • ESP/ESC, ABS or traction warning lamp illuminated
  • Intermittent or permanent loss of ESP/ABS functionality
  • Possible engine warning or limp-home behavior if other modules affected
  • Stored/continuously recurring C1102 code
  • Electrical symptoms: dimming lights, low accessory performance

What to check

  • Read all stored codes and freeze frame data with a full-function scanner; record related U/C codes
  • Measure battery open-circuit/resting voltage (with vehicle off)
  • Measure battery voltage during cranking and with engine running (charging voltage)
  • Perform a battery load test or check battery state-of-health (SLA/AGM-specific tests)
  • Visually inspect and clean battery terminals, cable ends and engine/chassis grounds
  • Inspect fuses and relays supplying BCM/ESP/ABS and replace if suspect

Signal parameters

  • Battery resting voltage: ~12.4–12.7 V (healthy); values < 12.0 V indicate discharged/weak battery
  • Cranking voltage: should generally stay above ~9.5 V (very low during severe cranking indicates weak battery)
  • Charging voltage (engine running): nominal 13.5–14.8 V (depends on vehicle charging specs)
  • ESP2/CAN message: periodic CAN frames expected from ESP/ABS node; absence for defined timeout triggers code
  • CAN bus idle voltages: CAN_H ~2.5–3.5 V, CAN_L ~1.5–2.5 V (use scope or CAN analyzer to confirm activity and differential)
  • Module supply pin at ESP/ABS: should match battery/ignition feed when key ON (no large drops under load)

Diagnostic algorithm

  1. Retrieve all DTCs and freeze frame; note related U/C codes and clear codes to see if C1102 returns.
  2. Visually inspect battery, terminals, cables, and main grounds. Clean and tighten battery connections.
  3. Measure and record battery voltage (key off), cranking voltage, and charging voltage (engine running).
  4. Perform battery load test or use battery tester to confirm battery capacity/health; replace battery if failing.
  5. Inspect and test alternator output and regulator if charging voltage out of range; repair charging system as needed.
  6. Check fuses/relays and wiring that supply the ESP/ABS and BCM for damage or open circuits; repair as required.
  7. Backprobe/measure voltage at the ESP/ABS module power and ground pins while cycling ignition to confirm stable supply.
  8. Use a scan tool or CAN bus analyzer to verify ESP2 messages are present; if messages missing, trace CAN wiring between nodes and repair shorts/opens or corrosion.
  9. If wiring and power are good but intermittent or permanent loss persists, consider module reprogramming or replacement per OEM procedure.
  10. After repairs, clear DTCs, test-drive and re-scan to confirm C1102 does not return and system operates normally.

Likely causes

  • Battery state-of-charge too low or battery failing (most likely)
  • Loose/corroded battery terminals or negative ground
  • Charging voltage below normal (alternator/regulator issue)
  • Faulty/loose connector at ESP/ABS module or BCM
  • CAN bus wiring fault between ESP2 and network nodes

Fault status

⚠️ Status
Battery voltage below acceptable threshold and/or ESP2 CAN messages not received (ESP/ABS communication timeout). Stability control may be disabled.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0 - 2.5 hours

Similar codes

C1100 C1101 U0100 U0121 U0073 P0562
856

Browse 856 MERCEDES-BENZ manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

MERCEDES-BENZ

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

C1102

Other C — Chassis

ABS Acceleration Switch Circuit Failure

Brand: Other
Type: C — Chassis
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Weak, discharged or failing battery
  • Poor battery terminal or cable connection (corrosion, loose)
  • Faulty or underperforming charging system (alternator, regulator)
  • Blown fuse, fusible link or relay supplying ESP/BCM
  • Bad ground connection between chassis/battery and modules
  • Damaged wiring or connectors on CAN bus between ESP/ABS and other modules

Symptoms

  • ESP/ESC, ABS or traction warning lamp illuminated
  • Intermittent or permanent loss of ESP/ABS functionality
  • Possible engine warning or limp-home behavior if other modules affected
  • Stored/continuously recurring C1102 code
  • Electrical symptoms: dimming lights, low accessory performance

What to check

  • Read all stored codes and freeze frame data with a full-function scanner; record related U/C codes
  • Measure battery open-circuit/resting voltage (with vehicle off)
  • Measure battery voltage during cranking and with engine running (charging voltage)
  • Perform a battery load test or check battery state-of-health (SLA/AGM-specific tests)
  • Visually inspect and clean battery terminals, cable ends and engine/chassis grounds
  • Inspect fuses and relays supplying BCM/ESP/ABS and replace if suspect

Signal parameters

  • Battery resting voltage: ~12.4–12.7 V (healthy); values < 12.0 V indicate discharged/weak battery
  • Cranking voltage: should generally stay above ~9.5 V (very low during severe cranking indicates weak battery)
  • Charging voltage (engine running): nominal 13.5–14.8 V (depends on vehicle charging specs)
  • ESP2/CAN message: periodic CAN frames expected from ESP/ABS node; absence for defined timeout triggers code
  • CAN bus idle voltages: CAN_H ~2.5–3.5 V, CAN_L ~1.5–2.5 V (use scope or CAN analyzer to confirm activity and differential)
  • Module supply pin at ESP/ABS: should match battery/ignition feed when key ON (no large drops under load)

Diagnostic algorithm

  1. Retrieve all DTCs and freeze frame; note related U/C codes and clear codes to see if C1102 returns.
  2. Visually inspect battery, terminals, cables, and main grounds. Clean and tighten battery connections.
  3. Measure and record battery voltage (key off), cranking voltage, and charging voltage (engine running).
  4. Perform battery load test or use battery tester to confirm battery capacity/health; replace battery if failing.
  5. Inspect and test alternator output and regulator if charging voltage out of range; repair charging system as needed.
  6. Check fuses/relays and wiring that supply the ESP/ABS and BCM for damage or open circuits; repair as required.
  7. Backprobe/measure voltage at the ESP/ABS module power and ground pins while cycling ignition to confirm stable supply.
  8. Use a scan tool or CAN bus analyzer to verify ESP2 messages are present; if messages missing, trace CAN wiring between nodes and repair shorts/opens or corrosion.
  9. If wiring and power are good but intermittent or permanent loss persists, consider module reprogramming or replacement per OEM procedure.
  10. After repairs, clear DTCs, test-drive and re-scan to confirm C1102 does not return and system operates normally.

Likely causes

  • Battery state-of-charge too low or battery failing (most likely)
  • Loose/corroded battery terminals or negative ground
  • Charging voltage below normal (alternator/regulator issue)
  • Faulty/loose connector at ESP/ABS module or BCM
  • CAN bus wiring fault between ESP2 and network nodes

Fault status

⚠️ Status
Battery voltage below acceptable threshold and/or ESP2 CAN messages not received (ESP/ABS communication timeout). Stability control may be disabled.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0 - 2.5 hours

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C1100 C1101 U0100 U0121 U0073 P0562
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