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Home / DTC / C1237 — High System Supply Voltage

C1237 — High System Supply Voltage

Detailed page for trouble code C1237.

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Code

C1237

HUMMER C — Chassis

High System Supply Voltage

Brand: HUMMER
Type: C — Chassis
Views: UK: 11 EN: 19 RU: 12
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Charging system producing excessive voltage (faulty alternator or voltage regulator)
  • Faulty or misconfigured aftermarket battery charger or booster/jump starter
  • Poor, corroded, or loose battery connections or grounds causing misleading readings
  • Intermittent high-voltage spikes (load dump) from wiring faults or a failed power module
  • Damaged or shorted wiring harness to the ABS/traction/control module
  • Failed power distribution module or fusible link producing overvoltage at the module

Symptoms

  • ABS, traction control or stability warning lamp illuminated
  • Intermittent or permanent fault/trip of chassis safety systems
  • Stored U0100/C0000-style communication errors in addition to C1237
  • Possible hard-start or electrical accessories behaving erratically if overvoltage is severe
  • Diminished vehicle drivability if a safety system enters limp mode

What to check

  • Retrieve freeze-frame data and all stored codes with a scan tool; note when voltage was recorded
  • Measure battery voltage with key off (should be ~12.4–12.8 V) and key on/engine off
  • Measure charging system voltage with engine running and electrical load applied (typical 13.5–14.8 V)
  • Inspect battery terminals, cable condition, and engine/ground straps for corrosion or looseness
  • Visually inspect alternator, connectors, and power distribution module for damage or aftermarket modifications
  • Check for aftermarket chargers, jump packs or in-vehicle voltage boosters still connected

Signal parameters

  • Normal battery resting voltage: ~12.4–12.8 V
  • Normal charging voltage (engine running): ~13.5–14.8 V
  • High system voltage fault commonly triggered above ~15–16 V (manufacturer-specific threshold)
  • Transient spikes/load-dump events can be significantly higher and may require an oscilloscope to detect
  • Voltage should remain stable under varying loads (AC, lights, fan). Large fluctuations indicate regulator or wiring problems

Diagnostic algorithm

  1. Verify: Read and record C1237 and any related codes and freeze-frame. Note engine state and recorded voltage.
  2. Visual: With vehicle off, inspect battery, terminals, ground straps, alternator connectors and power distribution fuses/links for damage or corrosion.
  3. Static voltage checks: Measure battery voltage at battery posts and at the affected module supply pin with key off and key on (engine off). Compare values.
  4. Charging test: Start engine and measure charging voltage at battery and module supply. Expect ~13.5–14.8 V. If >15 V, suspect alternator/regulator.
  5. Load test: Turn on headlights, blower, A/C, and observe voltage under load. Look for excessive voltage or large swings.
  6. Inspect for aftermarket devices: Remove or disconnect any chargers, battery tenders, isolators, or jump packs and retest.
  7. Scope/monitor: If intermittent or transient, use an oscilloscope to monitor supply for spikes (especially during load changes or shutdown).
  8. Wiring: If measured module supply differs from battery/alternator values, inspect and repair wiring, connectors, and grounds between the power source and module.
  9. Component replacement: If alternator/regulator is confirmed to be overcharging, replace/repair. If wiring/PD module is damaged, repair or replace as required.
  10. Verify: Clear codes, perform a road test and reproduce prior conditions to ensure C1237 does not return and system operates normally.

Likely causes

  • Alternator internal regulator stuck, producing >15 V while running
  • Loose or corroded ground/battery terminal causing transient high readings at the module
  • Aftermarket charger or jump starter left connected or malfunctioning
  • Shorted harness or damaged insulation allowing charging system voltage to appear on module supply
  • Failed body/power distribution module feeding the system with incorrect voltage

Fault status

⚠️ Status
High system supply voltage detected at a chassis control module. Check charging system, battery connections, and module supply wiring for overvoltage or spikes.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.5-3.0 hours

Similar codes

P0563 P0620 P0621 C1235 C1250
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Code

C1237

HYUNDAI C — Chassis

Front Height Sensor Low | Primary Pressure Sensor-Signal

Brand: HYUNDAI
Type: C — Chassis
Views: UK: 12 EN: 21 RU: 17
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Charging system producing excessive voltage (faulty alternator or voltage regulator)
  • Faulty or misconfigured aftermarket battery charger or booster/jump starter
  • Poor, corroded, or loose battery connections or grounds causing misleading readings
  • Intermittent high-voltage spikes (load dump) from wiring faults or a failed power module
  • Damaged or shorted wiring harness to the ABS/traction/control module
  • Failed power distribution module or fusible link producing overvoltage at the module

Symptoms

  • ABS, traction control or stability warning lamp illuminated
  • Intermittent or permanent fault/trip of chassis safety systems
  • Stored U0100/C0000-style communication errors in addition to C1237
  • Possible hard-start or electrical accessories behaving erratically if overvoltage is severe
  • Diminished vehicle drivability if a safety system enters limp mode

What to check

  • Retrieve freeze-frame data and all stored codes with a scan tool; note when voltage was recorded
  • Measure battery voltage with key off (should be ~12.4–12.8 V) and key on/engine off
  • Measure charging system voltage with engine running and electrical load applied (typical 13.5–14.8 V)
  • Inspect battery terminals, cable condition, and engine/ground straps for corrosion or looseness
  • Visually inspect alternator, connectors, and power distribution module for damage or aftermarket modifications
  • Check for aftermarket chargers, jump packs or in-vehicle voltage boosters still connected

Signal parameters

  • Normal battery resting voltage: ~12.4–12.8 V
  • Normal charging voltage (engine running): ~13.5–14.8 V
  • High system voltage fault commonly triggered above ~15–16 V (manufacturer-specific threshold)
  • Transient spikes/load-dump events can be significantly higher and may require an oscilloscope to detect
  • Voltage should remain stable under varying loads (AC, lights, fan). Large fluctuations indicate regulator or wiring problems

Diagnostic algorithm

  1. Verify: Read and record C1237 and any related codes and freeze-frame. Note engine state and recorded voltage.
  2. Visual: With vehicle off, inspect battery, terminals, ground straps, alternator connectors and power distribution fuses/links for damage or corrosion.
  3. Static voltage checks: Measure battery voltage at battery posts and at the affected module supply pin with key off and key on (engine off). Compare values.
  4. Charging test: Start engine and measure charging voltage at battery and module supply. Expect ~13.5–14.8 V. If >15 V, suspect alternator/regulator.
  5. Load test: Turn on headlights, blower, A/C, and observe voltage under load. Look for excessive voltage or large swings.
  6. Inspect for aftermarket devices: Remove or disconnect any chargers, battery tenders, isolators, or jump packs and retest.
  7. Scope/monitor: If intermittent or transient, use an oscilloscope to monitor supply for spikes (especially during load changes or shutdown).
  8. Wiring: If measured module supply differs from battery/alternator values, inspect and repair wiring, connectors, and grounds between the power source and module.
  9. Component replacement: If alternator/regulator is confirmed to be overcharging, replace/repair. If wiring/PD module is damaged, repair or replace as required.
  10. Verify: Clear codes, perform a road test and reproduce prior conditions to ensure C1237 does not return and system operates normally.

Likely causes

  • Alternator internal regulator stuck, producing >15 V while running
  • Loose or corroded ground/battery terminal causing transient high readings at the module
  • Aftermarket charger or jump starter left connected or malfunctioning
  • Shorted harness or damaged insulation allowing charging system voltage to appear on module supply
  • Failed body/power distribution module feeding the system with incorrect voltage

Fault status

⚠️ Status
High system supply voltage detected at a chassis control module. Check charging system, battery connections, and module supply wiring for overvoltage or spikes.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.5-3.0 hours

Similar codes

P0563 P0620 P0621 C1235 C1250
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

C1237

Other C — Chassis

Speed Wheel Rear Input Signal Missing

Brand: Other
Type: C — Chassis
Views: UK: 20 EN: 30 RU: 26
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Charging system producing excessive voltage (faulty alternator or voltage regulator)
  • Faulty or misconfigured aftermarket battery charger or booster/jump starter
  • Poor, corroded, or loose battery connections or grounds causing misleading readings
  • Intermittent high-voltage spikes (load dump) from wiring faults or a failed power module
  • Damaged or shorted wiring harness to the ABS/traction/control module
  • Failed power distribution module or fusible link producing overvoltage at the module

Symptoms

  • ABS, traction control or stability warning lamp illuminated
  • Intermittent or permanent fault/trip of chassis safety systems
  • Stored U0100/C0000-style communication errors in addition to C1237
  • Possible hard-start or electrical accessories behaving erratically if overvoltage is severe
  • Diminished vehicle drivability if a safety system enters limp mode

What to check

  • Retrieve freeze-frame data and all stored codes with a scan tool; note when voltage was recorded
  • Measure battery voltage with key off (should be ~12.4–12.8 V) and key on/engine off
  • Measure charging system voltage with engine running and electrical load applied (typical 13.5–14.8 V)
  • Inspect battery terminals, cable condition, and engine/ground straps for corrosion or looseness
  • Visually inspect alternator, connectors, and power distribution module for damage or aftermarket modifications
  • Check for aftermarket chargers, jump packs or in-vehicle voltage boosters still connected

Signal parameters

  • Normal battery resting voltage: ~12.4–12.8 V
  • Normal charging voltage (engine running): ~13.5–14.8 V
  • High system voltage fault commonly triggered above ~15–16 V (manufacturer-specific threshold)
  • Transient spikes/load-dump events can be significantly higher and may require an oscilloscope to detect
  • Voltage should remain stable under varying loads (AC, lights, fan). Large fluctuations indicate regulator or wiring problems

Diagnostic algorithm

  1. Verify: Read and record C1237 and any related codes and freeze-frame. Note engine state and recorded voltage.
  2. Visual: With vehicle off, inspect battery, terminals, ground straps, alternator connectors and power distribution fuses/links for damage or corrosion.
  3. Static voltage checks: Measure battery voltage at battery posts and at the affected module supply pin with key off and key on (engine off). Compare values.
  4. Charging test: Start engine and measure charging voltage at battery and module supply. Expect ~13.5–14.8 V. If >15 V, suspect alternator/regulator.
  5. Load test: Turn on headlights, blower, A/C, and observe voltage under load. Look for excessive voltage or large swings.
  6. Inspect for aftermarket devices: Remove or disconnect any chargers, battery tenders, isolators, or jump packs and retest.
  7. Scope/monitor: If intermittent or transient, use an oscilloscope to monitor supply for spikes (especially during load changes or shutdown).
  8. Wiring: If measured module supply differs from battery/alternator values, inspect and repair wiring, connectors, and grounds between the power source and module.
  9. Component replacement: If alternator/regulator is confirmed to be overcharging, replace/repair. If wiring/PD module is damaged, repair or replace as required.
  10. Verify: Clear codes, perform a road test and reproduce prior conditions to ensure C1237 does not return and system operates normally.

Likely causes

  • Alternator internal regulator stuck, producing >15 V while running
  • Loose or corroded ground/battery terminal causing transient high readings at the module
  • Aftermarket charger or jump starter left connected or malfunctioning
  • Shorted harness or damaged insulation allowing charging system voltage to appear on module supply
  • Failed body/power distribution module feeding the system with incorrect voltage

Fault status

⚠️ Status
High system supply voltage detected at a chassis control module. Check charging system, battery connections, and module supply wiring for overvoltage or spikes.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.5-3.0 hours

Similar codes

P0563 P0620 P0621 C1235 C1250
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