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Home / DTC / C1226 — Lamp Brake Warning Output Circuit Short To Ground

C1226 — Lamp Brake Warning Output Circuit Short To Ground

Detailed page for trouble code C1226.

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Code

C1226

Generic C — Chassis

Lamp Brake Warning Output Circuit Short To Ground

Brand: Generic
Type: C — Chassis
Views: UK: 16 EN: 25 RU: 18
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Damaged/chafed wiring harness with insulation worn through to chassis ground
  • Corroded, loose, or pushed-back connector terminals making unintended ground contact
  • Failed bulb or lamp assembly with internal short to ground
  • Aftermarket accessory or repair routed/connected incorrectly and grounding the circuit
  • Failed control module/ECU driver transistor that presents a short to ground
  • Blown or faulty fuse related to the brake warning circuit

Symptoms

  • Brake warning lamp illuminated or behavior abnormal (stuck ON/OFF or flicker)
  • Brake warning/instrument cluster errors or multiple related warnings
  • Brake lights may not operate correctly or may be dim
  • Blown fuse(s) for brake lamp or warning circuit
  • Possible battery drain or parasitic draw when parked

What to check

  • Retrieve freeze-frame and code history with scan tool; check for related codes
  • Visually inspect wiring, connectors and lamp sockets at rear and near chassis grounding points
  • Inspect fuses and fuse holder for signs of overheating or corrosion
  • Remove lamp/bulb and check for internal short or melted insulation
  • Backprobe harness at connector and measure voltages with connector connected and disconnected
  • Perform wiggle test while monitoring circuit voltage/current to reproduce the fault

Signal parameters

  • Expected resting voltage when lamp not commanded: ~0–0.5 V (if low-side switching) or battery voltage if high-side — consult vehicle wiring diagram
  • Expected commanded voltage: near battery nominal (about 12–14 V) at lamp connector when lamp is driven
  • Short to ground indicated by very low resistance to chassis ground (near 0 Ω) at the output pin
  • Open circuit indicated by very high resistance or infinite
  • Typical lamp circuit fuse rating and current draw depend on vehicle (measure current if fuse is intact)

Diagnostic algorithm

  1. Read and record all DTCs and freeze-frame data; clear codes and see if C1226 returns.
  2. Visually inspect lamp, socket, harness, connectors, and nearby body panels for damage, corrosion, or aftermarket taps.
  3. Check fuses and replace if blown; test whether fuse blows immediately or only when circuit is activated.
  4. Remove the lamp/bulb and measure resistance between the output pin and chassis ground. A very low resistance indicates a short.
  5. With connector disconnected, backprobe the module output and measure voltage while commanding the brake warning lamp on/off via scan tool. Confirm whether module output is shorted to ground.
  6. If output is shorted with connector disconnected, suspect internal module failure and test/replace module per manufacturer instructions.
  7. If output is normal with connector disconnected, inspect wiring harness between module and lamp for short to ground (use wiring diagrams to identify intermediate connectors and splice points).
  8. Repair damaged wiring, replace corroded connectors or sockets, and isolate/repair any aftermarket connections. Protect repaired sections with proper routing and insulation.
  9. After repair, clear codes and verify proper operation of lamp and absence of the fault on a road test or cycles that reproduced the condition.
  10. If fault persists after wiring and lamp checks, consult OEM technical service information for module bench tests or replace the control module if confirmed faulty.

Likely causes

  • Wiring rubbed against body/frame or sharp edge, creating short to ground
  • Connector contamination (water, corrosion) causing a grounded return path
  • Lamp socket contact bent or touching body metal
  • Recent service or aftermarket installation disturbed harness near brake lamp circuits
  • Internal module power-stage failure presenting low resistance to ground

Fault status

⚠️ Status
Lamp Brake Warning Output Circuit Short To Ground — the brake warning lamp output is detecting a short to chassis ground, preventing proper lamp control and indicating a wiring, connector, lamp, or module fault.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.5 hours

Similar codes

C1225 C1227 C1251 U0121 U0126
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Code

C1226

HUMMER C — Chassis

Right Front Excessive Wheel Speed Variation

Brand: HUMMER
Type: C — Chassis
Views: UK: 8 EN: 13 RU: 12
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Damaged/chafed wiring harness with insulation worn through to chassis ground
  • Corroded, loose, or pushed-back connector terminals making unintended ground contact
  • Failed bulb or lamp assembly with internal short to ground
  • Aftermarket accessory or repair routed/connected incorrectly and grounding the circuit
  • Failed control module/ECU driver transistor that presents a short to ground
  • Blown or faulty fuse related to the brake warning circuit

Symptoms

  • Brake warning lamp illuminated or behavior abnormal (stuck ON/OFF or flicker)
  • Brake warning/instrument cluster errors or multiple related warnings
  • Brake lights may not operate correctly or may be dim
  • Blown fuse(s) for brake lamp or warning circuit
  • Possible battery drain or parasitic draw when parked

What to check

  • Retrieve freeze-frame and code history with scan tool; check for related codes
  • Visually inspect wiring, connectors and lamp sockets at rear and near chassis grounding points
  • Inspect fuses and fuse holder for signs of overheating or corrosion
  • Remove lamp/bulb and check for internal short or melted insulation
  • Backprobe harness at connector and measure voltages with connector connected and disconnected
  • Perform wiggle test while monitoring circuit voltage/current to reproduce the fault

Signal parameters

  • Expected resting voltage when lamp not commanded: ~0–0.5 V (if low-side switching) or battery voltage if high-side — consult vehicle wiring diagram
  • Expected commanded voltage: near battery nominal (about 12–14 V) at lamp connector when lamp is driven
  • Short to ground indicated by very low resistance to chassis ground (near 0 Ω) at the output pin
  • Open circuit indicated by very high resistance or infinite
  • Typical lamp circuit fuse rating and current draw depend on vehicle (measure current if fuse is intact)

Diagnostic algorithm

  1. Read and record all DTCs and freeze-frame data; clear codes and see if C1226 returns.
  2. Visually inspect lamp, socket, harness, connectors, and nearby body panels for damage, corrosion, or aftermarket taps.
  3. Check fuses and replace if blown; test whether fuse blows immediately or only when circuit is activated.
  4. Remove the lamp/bulb and measure resistance between the output pin and chassis ground. A very low resistance indicates a short.
  5. With connector disconnected, backprobe the module output and measure voltage while commanding the brake warning lamp on/off via scan tool. Confirm whether module output is shorted to ground.
  6. If output is shorted with connector disconnected, suspect internal module failure and test/replace module per manufacturer instructions.
  7. If output is normal with connector disconnected, inspect wiring harness between module and lamp for short to ground (use wiring diagrams to identify intermediate connectors and splice points).
  8. Repair damaged wiring, replace corroded connectors or sockets, and isolate/repair any aftermarket connections. Protect repaired sections with proper routing and insulation.
  9. After repair, clear codes and verify proper operation of lamp and absence of the fault on a road test or cycles that reproduced the condition.
  10. If fault persists after wiring and lamp checks, consult OEM technical service information for module bench tests or replace the control module if confirmed faulty.

Likely causes

  • Wiring rubbed against body/frame or sharp edge, creating short to ground
  • Connector contamination (water, corrosion) causing a grounded return path
  • Lamp socket contact bent or touching body metal
  • Recent service or aftermarket installation disturbed harness near brake lamp circuits
  • Internal module power-stage failure presenting low resistance to ground

Fault status

⚠️ Status
Lamp Brake Warning Output Circuit Short To Ground — the brake warning lamp output is detecting a short to chassis ground, preventing proper lamp control and indicating a wiring, connector, lamp, or module fault.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.5 hours

Similar codes

C1225 C1227 C1251 U0121 U0126
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Keep it short and practical. Up to 500 characters.
Send to email
Code

C1226

HYUNDAI C — Chassis

ASC Potentiometer - High Input

Brand: HYUNDAI
Type: C — Chassis
Views: UK: 17 EN: 20 RU: 19
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Damaged/chafed wiring harness with insulation worn through to chassis ground
  • Corroded, loose, or pushed-back connector terminals making unintended ground contact
  • Failed bulb or lamp assembly with internal short to ground
  • Aftermarket accessory or repair routed/connected incorrectly and grounding the circuit
  • Failed control module/ECU driver transistor that presents a short to ground
  • Blown or faulty fuse related to the brake warning circuit

Symptoms

  • Brake warning lamp illuminated or behavior abnormal (stuck ON/OFF or flicker)
  • Brake warning/instrument cluster errors or multiple related warnings
  • Brake lights may not operate correctly or may be dim
  • Blown fuse(s) for brake lamp or warning circuit
  • Possible battery drain or parasitic draw when parked

What to check

  • Retrieve freeze-frame and code history with scan tool; check for related codes
  • Visually inspect wiring, connectors and lamp sockets at rear and near chassis grounding points
  • Inspect fuses and fuse holder for signs of overheating or corrosion
  • Remove lamp/bulb and check for internal short or melted insulation
  • Backprobe harness at connector and measure voltages with connector connected and disconnected
  • Perform wiggle test while monitoring circuit voltage/current to reproduce the fault

Signal parameters

  • Expected resting voltage when lamp not commanded: ~0–0.5 V (if low-side switching) or battery voltage if high-side — consult vehicle wiring diagram
  • Expected commanded voltage: near battery nominal (about 12–14 V) at lamp connector when lamp is driven
  • Short to ground indicated by very low resistance to chassis ground (near 0 Ω) at the output pin
  • Open circuit indicated by very high resistance or infinite
  • Typical lamp circuit fuse rating and current draw depend on vehicle (measure current if fuse is intact)

Diagnostic algorithm

  1. Read and record all DTCs and freeze-frame data; clear codes and see if C1226 returns.
  2. Visually inspect lamp, socket, harness, connectors, and nearby body panels for damage, corrosion, or aftermarket taps.
  3. Check fuses and replace if blown; test whether fuse blows immediately or only when circuit is activated.
  4. Remove the lamp/bulb and measure resistance between the output pin and chassis ground. A very low resistance indicates a short.
  5. With connector disconnected, backprobe the module output and measure voltage while commanding the brake warning lamp on/off via scan tool. Confirm whether module output is shorted to ground.
  6. If output is shorted with connector disconnected, suspect internal module failure and test/replace module per manufacturer instructions.
  7. If output is normal with connector disconnected, inspect wiring harness between module and lamp for short to ground (use wiring diagrams to identify intermediate connectors and splice points).
  8. Repair damaged wiring, replace corroded connectors or sockets, and isolate/repair any aftermarket connections. Protect repaired sections with proper routing and insulation.
  9. After repair, clear codes and verify proper operation of lamp and absence of the fault on a road test or cycles that reproduced the condition.
  10. If fault persists after wiring and lamp checks, consult OEM technical service information for module bench tests or replace the control module if confirmed faulty.

Likely causes

  • Wiring rubbed against body/frame or sharp edge, creating short to ground
  • Connector contamination (water, corrosion) causing a grounded return path
  • Lamp socket contact bent or touching body metal
  • Recent service or aftermarket installation disturbed harness near brake lamp circuits
  • Internal module power-stage failure presenting low resistance to ground

Fault status

⚠️ Status
Lamp Brake Warning Output Circuit Short To Ground — the brake warning lamp output is detecting a short to chassis ground, preventing proper lamp control and indicating a wiring, connector, lamp, or module fault.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.5 hours

Similar codes

C1225 C1227 C1251 U0121 U0126
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

C1226

MITSUBISHI C — Chassis

FR inlet valve

Brand: MITSUBISHI
Type: C — Chassis
Views: UK: 5 EN: 12 RU: 10
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Damaged/chafed wiring harness with insulation worn through to chassis ground
  • Corroded, loose, or pushed-back connector terminals making unintended ground contact
  • Failed bulb or lamp assembly with internal short to ground
  • Aftermarket accessory or repair routed/connected incorrectly and grounding the circuit
  • Failed control module/ECU driver transistor that presents a short to ground
  • Blown or faulty fuse related to the brake warning circuit

Symptoms

  • Brake warning lamp illuminated or behavior abnormal (stuck ON/OFF or flicker)
  • Brake warning/instrument cluster errors or multiple related warnings
  • Brake lights may not operate correctly or may be dim
  • Blown fuse(s) for brake lamp or warning circuit
  • Possible battery drain or parasitic draw when parked

What to check

  • Retrieve freeze-frame and code history with scan tool; check for related codes
  • Visually inspect wiring, connectors and lamp sockets at rear and near chassis grounding points
  • Inspect fuses and fuse holder for signs of overheating or corrosion
  • Remove lamp/bulb and check for internal short or melted insulation
  • Backprobe harness at connector and measure voltages with connector connected and disconnected
  • Perform wiggle test while monitoring circuit voltage/current to reproduce the fault

Signal parameters

  • Expected resting voltage when lamp not commanded: ~0–0.5 V (if low-side switching) or battery voltage if high-side — consult vehicle wiring diagram
  • Expected commanded voltage: near battery nominal (about 12–14 V) at lamp connector when lamp is driven
  • Short to ground indicated by very low resistance to chassis ground (near 0 Ω) at the output pin
  • Open circuit indicated by very high resistance or infinite
  • Typical lamp circuit fuse rating and current draw depend on vehicle (measure current if fuse is intact)

Diagnostic algorithm

  1. Read and record all DTCs and freeze-frame data; clear codes and see if C1226 returns.
  2. Visually inspect lamp, socket, harness, connectors, and nearby body panels for damage, corrosion, or aftermarket taps.
  3. Check fuses and replace if blown; test whether fuse blows immediately or only when circuit is activated.
  4. Remove the lamp/bulb and measure resistance between the output pin and chassis ground. A very low resistance indicates a short.
  5. With connector disconnected, backprobe the module output and measure voltage while commanding the brake warning lamp on/off via scan tool. Confirm whether module output is shorted to ground.
  6. If output is shorted with connector disconnected, suspect internal module failure and test/replace module per manufacturer instructions.
  7. If output is normal with connector disconnected, inspect wiring harness between module and lamp for short to ground (use wiring diagrams to identify intermediate connectors and splice points).
  8. Repair damaged wiring, replace corroded connectors or sockets, and isolate/repair any aftermarket connections. Protect repaired sections with proper routing and insulation.
  9. After repair, clear codes and verify proper operation of lamp and absence of the fault on a road test or cycles that reproduced the condition.
  10. If fault persists after wiring and lamp checks, consult OEM technical service information for module bench tests or replace the control module if confirmed faulty.

Likely causes

  • Wiring rubbed against body/frame or sharp edge, creating short to ground
  • Connector contamination (water, corrosion) causing a grounded return path
  • Lamp socket contact bent or touching body metal
  • Recent service or aftermarket installation disturbed harness near brake lamp circuits
  • Internal module power-stage failure presenting low resistance to ground

Fault status

⚠️ Status
Lamp Brake Warning Output Circuit Short To Ground — the brake warning lamp output is detecting a short to chassis ground, preventing proper lamp control and indicating a wiring, connector, lamp, or module fault.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.5 hours

Similar codes

C1225 C1227 C1251 U0121 U0126
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Code

C1226

Other C — Chassis

Lamp Brake Warning Output Circuit Short To Ground

Brand: Other
Type: C — Chassis
Views: UK: 20 EN: 24 RU: 32
AI status
Completed
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Completed 100%
Page language: EN

Causes

  • Damaged/chafed wiring harness with insulation worn through to chassis ground
  • Corroded, loose, or pushed-back connector terminals making unintended ground contact
  • Failed bulb or lamp assembly with internal short to ground
  • Aftermarket accessory or repair routed/connected incorrectly and grounding the circuit
  • Failed control module/ECU driver transistor that presents a short to ground
  • Blown or faulty fuse related to the brake warning circuit

Symptoms

  • Brake warning lamp illuminated or behavior abnormal (stuck ON/OFF or flicker)
  • Brake warning/instrument cluster errors or multiple related warnings
  • Brake lights may not operate correctly or may be dim
  • Blown fuse(s) for brake lamp or warning circuit
  • Possible battery drain or parasitic draw when parked

What to check

  • Retrieve freeze-frame and code history with scan tool; check for related codes
  • Visually inspect wiring, connectors and lamp sockets at rear and near chassis grounding points
  • Inspect fuses and fuse holder for signs of overheating or corrosion
  • Remove lamp/bulb and check for internal short or melted insulation
  • Backprobe harness at connector and measure voltages with connector connected and disconnected
  • Perform wiggle test while monitoring circuit voltage/current to reproduce the fault

Signal parameters

  • Expected resting voltage when lamp not commanded: ~0–0.5 V (if low-side switching) or battery voltage if high-side — consult vehicle wiring diagram
  • Expected commanded voltage: near battery nominal (about 12–14 V) at lamp connector when lamp is driven
  • Short to ground indicated by very low resistance to chassis ground (near 0 Ω) at the output pin
  • Open circuit indicated by very high resistance or infinite
  • Typical lamp circuit fuse rating and current draw depend on vehicle (measure current if fuse is intact)

Diagnostic algorithm

  1. Read and record all DTCs and freeze-frame data; clear codes and see if C1226 returns.
  2. Visually inspect lamp, socket, harness, connectors, and nearby body panels for damage, corrosion, or aftermarket taps.
  3. Check fuses and replace if blown; test whether fuse blows immediately or only when circuit is activated.
  4. Remove the lamp/bulb and measure resistance between the output pin and chassis ground. A very low resistance indicates a short.
  5. With connector disconnected, backprobe the module output and measure voltage while commanding the brake warning lamp on/off via scan tool. Confirm whether module output is shorted to ground.
  6. If output is shorted with connector disconnected, suspect internal module failure and test/replace module per manufacturer instructions.
  7. If output is normal with connector disconnected, inspect wiring harness between module and lamp for short to ground (use wiring diagrams to identify intermediate connectors and splice points).
  8. Repair damaged wiring, replace corroded connectors or sockets, and isolate/repair any aftermarket connections. Protect repaired sections with proper routing and insulation.
  9. After repair, clear codes and verify proper operation of lamp and absence of the fault on a road test or cycles that reproduced the condition.
  10. If fault persists after wiring and lamp checks, consult OEM technical service information for module bench tests or replace the control module if confirmed faulty.

Likely causes

  • Wiring rubbed against body/frame or sharp edge, creating short to ground
  • Connector contamination (water, corrosion) causing a grounded return path
  • Lamp socket contact bent or touching body metal
  • Recent service or aftermarket installation disturbed harness near brake lamp circuits
  • Internal module power-stage failure presenting low resistance to ground

Fault status

⚠️ Status
Lamp Brake Warning Output Circuit Short To Ground — the brake warning lamp output is detecting a short to chassis ground, preventing proper lamp control and indicating a wiring, connector, lamp, or module fault.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.5 hours

Similar codes

C1225 C1227 C1251 U0121 U0126
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