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Home / DTC / P1799 — CAN transmission control module / module circuit fault ABS control

P1799 — CAN transmission control module / module circuit fault ABS control

Detailed page for trouble code P1799.

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P1799

LAND ROVER P — Powertrain

CAN transmission control module / module circuit fault ABS control

Brand: LAND ROVER
Type: P — Powertrain
Views: UK: 4 EN: 7 RU: 4
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Damaged or corroded CAN-H/CAN-L wiring or connectors between TCM and ABS
  • Faulty TCM, ABS module, or other module on same CAN segment
  • Poor or intermittent ground or battery supply to one or more modules
  • Blown fuse or poor power feed to modules
  • Water intrusion or corrosion in connectors
  • CAN bus termination resistor open or shorted

Symptoms

  • MIL/ABS warning lamp illuminated
  • Transmission enters limp/home mode or displays shift faults
  • Intermittent or permanent loss of ABS traction control or stability functions
  • Multiple CAN-related U-codes present
  • Erratic or lost communication with one or more modules (no comms)
  • Sometimes vehicle may start fine then develop faults while driving

What to check

  • Read all stored and pending DTCs from all modules; note freeze frame and timestamps
  • Check battery voltage and charging system under load
  • Visually inspect CAN connectors for corrosion, bent pins, water ingress
  • Wiggle test wiring harness around TCM/ABS while monitoring for changes in communication
  • Verify module power and ground circuits (voltage and continuity checks)
  • Measure CAN bus idle voltages on CAN-H and CAN-L with key on, engine off

Signal parameters

  • CAN bus idle voltages: CAN-H ~2.5V, CAN-L ~2.5V (each), differential ~0V when recessive
  • Dominant state: CAN-H rises toward ~3.5V and CAN-L falls toward ~1.5V, differential ~2.0V during frames
  • Normal bus termination: two 120 Ω resistors in parallel ≈ 60 Ω across CAN-H and CAN-L
  • Common data rates: 250 kbps or 500 kbps depending on vehicle network segment (verify factory spec)
  • Oscilloscope will show regular CAN frames; noise, missing frames, or distorted edges indicate faults

Diagnostic algorithm

  1. Use a full-function scan tool to read all modules; log P1799 plus any U-codes and freeze-frame data.
  2. Verify battery state-of-charge and charging. Low voltage can cause intermittent CAN faults—restore to normal before further testing.
  3. Visually inspect and reseat connectors at TCM, ABS module, and any junctions or gateway modules. Look for corrosion, bent pins, or moisture.
  4. Check fuses/power supplies and test module ground points for low resistance to chassis.
  5. With ignition ON, measure steady-state voltages at CAN-H and CAN-L at both TCM and ABS connectors. Compare readings to expected values.
  6. Measure resistance across CAN-H to CAN-L with key off; expect ~60 Ω across the whole bus. If open or very low, isolate sections to find fault.
  7. Use an oscilloscope or CAN bus analyzer to view waveform quality and message traffic. Look for missing frames, error flags, or dominant stuck bits.
  8. If wiring looks good, swap or bench-test suspect module only if manufacturer procedure allows. Follow Land Rover service manual for module reprogramming
  9. Clear codes and perform test drive to verify repair. If fault recurs, follow network isolation procedures to locate intermittent wiring or failing module.
  10. If intermittent and cannot be replicated, inspect for aftermarket devices, route harness chafing, and perform longer road tests with data logging.

Likely causes

  • Corroded or loose connector at TCM or ABS (common on Land Rover models)
  • Open or short in CAN wiring harness between modules
  • Missing/failed chassis ground or low battery voltage
  • Failed ABS module or TCM hardware
  • Faulty termination (open/shorted 60 Ω resistor pair) on CAN bus

Fault status

⚠️ Status
CAN transmission control module / module circuit fault ABS control — indicates loss or corruption of CAN messages between the Transmission Control Module and ABS control module; communication may be intermittent or permanent.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 2-4 hours

Similar codes

U0100 U0105 U0121 U0073 P0700
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Code

P1799

MAZDA P — Powertrain

Hold Switch Circuit

Brand: MAZDA
Type: P — Powertrain
Views: UK: 14 EN: 17 RU: 15
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Damaged or corroded CAN-H/CAN-L wiring or connectors between TCM and ABS
  • Faulty TCM, ABS module, or other module on same CAN segment
  • Poor or intermittent ground or battery supply to one or more modules
  • Blown fuse or poor power feed to modules
  • Water intrusion or corrosion in connectors
  • CAN bus termination resistor open or shorted

Symptoms

  • MIL/ABS warning lamp illuminated
  • Transmission enters limp/home mode or displays shift faults
  • Intermittent or permanent loss of ABS traction control or stability functions
  • Multiple CAN-related U-codes present
  • Erratic or lost communication with one or more modules (no comms)
  • Sometimes vehicle may start fine then develop faults while driving

What to check

  • Read all stored and pending DTCs from all modules; note freeze frame and timestamps
  • Check battery voltage and charging system under load
  • Visually inspect CAN connectors for corrosion, bent pins, water ingress
  • Wiggle test wiring harness around TCM/ABS while monitoring for changes in communication
  • Verify module power and ground circuits (voltage and continuity checks)
  • Measure CAN bus idle voltages on CAN-H and CAN-L with key on, engine off

Signal parameters

  • CAN bus idle voltages: CAN-H ~2.5V, CAN-L ~2.5V (each), differential ~0V when recessive
  • Dominant state: CAN-H rises toward ~3.5V and CAN-L falls toward ~1.5V, differential ~2.0V during frames
  • Normal bus termination: two 120 Ω resistors in parallel ≈ 60 Ω across CAN-H and CAN-L
  • Common data rates: 250 kbps or 500 kbps depending on vehicle network segment (verify factory spec)
  • Oscilloscope will show regular CAN frames; noise, missing frames, or distorted edges indicate faults

Diagnostic algorithm

  1. Use a full-function scan tool to read all modules; log P1799 plus any U-codes and freeze-frame data.
  2. Verify battery state-of-charge and charging. Low voltage can cause intermittent CAN faults—restore to normal before further testing.
  3. Visually inspect and reseat connectors at TCM, ABS module, and any junctions or gateway modules. Look for corrosion, bent pins, or moisture.
  4. Check fuses/power supplies and test module ground points for low resistance to chassis.
  5. With ignition ON, measure steady-state voltages at CAN-H and CAN-L at both TCM and ABS connectors. Compare readings to expected values.
  6. Measure resistance across CAN-H to CAN-L with key off; expect ~60 Ω across the whole bus. If open or very low, isolate sections to find fault.
  7. Use an oscilloscope or CAN bus analyzer to view waveform quality and message traffic. Look for missing frames, error flags, or dominant stuck bits.
  8. If wiring looks good, swap or bench-test suspect module only if manufacturer procedure allows. Follow Land Rover service manual for module reprogramming
  9. Clear codes and perform test drive to verify repair. If fault recurs, follow network isolation procedures to locate intermittent wiring or failing module.
  10. If intermittent and cannot be replicated, inspect for aftermarket devices, route harness chafing, and perform longer road tests with data logging.

Likely causes

  • Corroded or loose connector at TCM or ABS (common on Land Rover models)
  • Open or short in CAN wiring harness between modules
  • Missing/failed chassis ground or low battery voltage
  • Failed ABS module or TCM hardware
  • Faulty termination (open/shorted 60 Ω resistor pair) on CAN bus

Fault status

⚠️ Status
CAN transmission control module / module circuit fault ABS control — indicates loss or corruption of CAN messages between the Transmission Control Module and ABS control module; communication may be intermittent or permanent.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 2-4 hours

Similar codes

U0100 U0105 U0121 U0073 P0700
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Keep it short and practical. Up to 500 characters.
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Code

P1799

NISSAN P — Powertrain

Hold Switch Circuit

Brand: NISSAN
Type: P — Powertrain
Views: UK: 13 EN: 14 RU: 15
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Damaged or corroded CAN-H/CAN-L wiring or connectors between TCM and ABS
  • Faulty TCM, ABS module, or other module on same CAN segment
  • Poor or intermittent ground or battery supply to one or more modules
  • Blown fuse or poor power feed to modules
  • Water intrusion or corrosion in connectors
  • CAN bus termination resistor open or shorted

Symptoms

  • MIL/ABS warning lamp illuminated
  • Transmission enters limp/home mode or displays shift faults
  • Intermittent or permanent loss of ABS traction control or stability functions
  • Multiple CAN-related U-codes present
  • Erratic or lost communication with one or more modules (no comms)
  • Sometimes vehicle may start fine then develop faults while driving

What to check

  • Read all stored and pending DTCs from all modules; note freeze frame and timestamps
  • Check battery voltage and charging system under load
  • Visually inspect CAN connectors for corrosion, bent pins, water ingress
  • Wiggle test wiring harness around TCM/ABS while monitoring for changes in communication
  • Verify module power and ground circuits (voltage and continuity checks)
  • Measure CAN bus idle voltages on CAN-H and CAN-L with key on, engine off

Signal parameters

  • CAN bus idle voltages: CAN-H ~2.5V, CAN-L ~2.5V (each), differential ~0V when recessive
  • Dominant state: CAN-H rises toward ~3.5V and CAN-L falls toward ~1.5V, differential ~2.0V during frames
  • Normal bus termination: two 120 Ω resistors in parallel ≈ 60 Ω across CAN-H and CAN-L
  • Common data rates: 250 kbps or 500 kbps depending on vehicle network segment (verify factory spec)
  • Oscilloscope will show regular CAN frames; noise, missing frames, or distorted edges indicate faults

Diagnostic algorithm

  1. Use a full-function scan tool to read all modules; log P1799 plus any U-codes and freeze-frame data.
  2. Verify battery state-of-charge and charging. Low voltage can cause intermittent CAN faults—restore to normal before further testing.
  3. Visually inspect and reseat connectors at TCM, ABS module, and any junctions or gateway modules. Look for corrosion, bent pins, or moisture.
  4. Check fuses/power supplies and test module ground points for low resistance to chassis.
  5. With ignition ON, measure steady-state voltages at CAN-H and CAN-L at both TCM and ABS connectors. Compare readings to expected values.
  6. Measure resistance across CAN-H to CAN-L with key off; expect ~60 Ω across the whole bus. If open or very low, isolate sections to find fault.
  7. Use an oscilloscope or CAN bus analyzer to view waveform quality and message traffic. Look for missing frames, error flags, or dominant stuck bits.
  8. If wiring looks good, swap or bench-test suspect module only if manufacturer procedure allows. Follow Land Rover service manual for module reprogramming
  9. Clear codes and perform test drive to verify repair. If fault recurs, follow network isolation procedures to locate intermittent wiring or failing module.
  10. If intermittent and cannot be replicated, inspect for aftermarket devices, route harness chafing, and perform longer road tests with data logging.

Likely causes

  • Corroded or loose connector at TCM or ABS (common on Land Rover models)
  • Open or short in CAN wiring harness between modules
  • Missing/failed chassis ground or low battery voltage
  • Failed ABS module or TCM hardware
  • Faulty termination (open/shorted 60 Ω resistor pair) on CAN bus

Fault status

⚠️ Status
CAN transmission control module / module circuit fault ABS control — indicates loss or corruption of CAN messages between the Transmission Control Module and ABS control module; communication may be intermittent or permanent.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 2-4 hours

Similar codes

U0100 U0105 U0121 U0073 P0700
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

P1799

Other P — Powertrain

Hold Switch Circuit Malfunction

Brand: Other
Type: P — Powertrain
Views: UK: 16 EN: 17 RU: 16
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Damaged or corroded CAN-H/CAN-L wiring or connectors between TCM and ABS
  • Faulty TCM, ABS module, or other module on same CAN segment
  • Poor or intermittent ground or battery supply to one or more modules
  • Blown fuse or poor power feed to modules
  • Water intrusion or corrosion in connectors
  • CAN bus termination resistor open or shorted

Symptoms

  • MIL/ABS warning lamp illuminated
  • Transmission enters limp/home mode or displays shift faults
  • Intermittent or permanent loss of ABS traction control or stability functions
  • Multiple CAN-related U-codes present
  • Erratic or lost communication with one or more modules (no comms)
  • Sometimes vehicle may start fine then develop faults while driving

What to check

  • Read all stored and pending DTCs from all modules; note freeze frame and timestamps
  • Check battery voltage and charging system under load
  • Visually inspect CAN connectors for corrosion, bent pins, water ingress
  • Wiggle test wiring harness around TCM/ABS while monitoring for changes in communication
  • Verify module power and ground circuits (voltage and continuity checks)
  • Measure CAN bus idle voltages on CAN-H and CAN-L with key on, engine off

Signal parameters

  • CAN bus idle voltages: CAN-H ~2.5V, CAN-L ~2.5V (each), differential ~0V when recessive
  • Dominant state: CAN-H rises toward ~3.5V and CAN-L falls toward ~1.5V, differential ~2.0V during frames
  • Normal bus termination: two 120 Ω resistors in parallel ≈ 60 Ω across CAN-H and CAN-L
  • Common data rates: 250 kbps or 500 kbps depending on vehicle network segment (verify factory spec)
  • Oscilloscope will show regular CAN frames; noise, missing frames, or distorted edges indicate faults

Diagnostic algorithm

  1. Use a full-function scan tool to read all modules; log P1799 plus any U-codes and freeze-frame data.
  2. Verify battery state-of-charge and charging. Low voltage can cause intermittent CAN faults—restore to normal before further testing.
  3. Visually inspect and reseat connectors at TCM, ABS module, and any junctions or gateway modules. Look for corrosion, bent pins, or moisture.
  4. Check fuses/power supplies and test module ground points for low resistance to chassis.
  5. With ignition ON, measure steady-state voltages at CAN-H and CAN-L at both TCM and ABS connectors. Compare readings to expected values.
  6. Measure resistance across CAN-H to CAN-L with key off; expect ~60 Ω across the whole bus. If open or very low, isolate sections to find fault.
  7. Use an oscilloscope or CAN bus analyzer to view waveform quality and message traffic. Look for missing frames, error flags, or dominant stuck bits.
  8. If wiring looks good, swap or bench-test suspect module only if manufacturer procedure allows. Follow Land Rover service manual for module reprogramming
  9. Clear codes and perform test drive to verify repair. If fault recurs, follow network isolation procedures to locate intermittent wiring or failing module.
  10. If intermittent and cannot be replicated, inspect for aftermarket devices, route harness chafing, and perform longer road tests with data logging.

Likely causes

  • Corroded or loose connector at TCM or ABS (common on Land Rover models)
  • Open or short in CAN wiring harness between modules
  • Missing/failed chassis ground or low battery voltage
  • Failed ABS module or TCM hardware
  • Faulty termination (open/shorted 60 Ω resistor pair) on CAN bus

Fault status

⚠️ Status
CAN transmission control module / module circuit fault ABS control — indicates loss or corruption of CAN messages between the Transmission Control Module and ABS control module; communication may be intermittent or permanent.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 2-4 hours

Similar codes

U0100 U0105 U0121 U0073 P0700
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Short description

Workshop manual for the Audi Q8 (2018) — Electrical System. Includes technical data, safety notes and step‑by‑step repair procedures for battery/charging, starter/alternator, lighting, washer/wiper and wiring. Edition 05.2019.

199,00 UAH
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Key sections:
  • 00 - Technical data
  • 1 Safety precautions
  • 1.1 Safety precautions when working on vehicles with start/stop system
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  • 1.3 Notes on use and safety for LED headlights and Audi laser lights
  • 2 Repair notes
  • 2.1 Rules for cleanliness
  • 2.2 General notes
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  • 1.1 General Repair Information
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Official workshop manual for the Land Rover Defender 300Tdi (from 1996 model year). Contains specifications, adjustment, fault diagnosis and step-by-step repair and overhaul procedures for engine, transmission, axles, suspension, brakes, electrical and body. Intended for dealer workshops and trained technicians.

199,00 UAH
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Key sections:
  • 01 INTRODUCTION
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  • 05 ENGINE TUNING DATA
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  • 09 LUBRICANTS, FLUIDS AND CAPACITIES
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Code

P1799

RAM P — Powertrain

Calculated oil temperature in use.

Brand: RAM
Type: P — Powertrain
Views: UK: 3 EN: 4 RU: 3
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Damaged or corroded CAN-H/CAN-L wiring or connectors between TCM and ABS
  • Faulty TCM, ABS module, or other module on same CAN segment
  • Poor or intermittent ground or battery supply to one or more modules
  • Blown fuse or poor power feed to modules
  • Water intrusion or corrosion in connectors
  • CAN bus termination resistor open or shorted

Symptoms

  • MIL/ABS warning lamp illuminated
  • Transmission enters limp/home mode or displays shift faults
  • Intermittent or permanent loss of ABS traction control or stability functions
  • Multiple CAN-related U-codes present
  • Erratic or lost communication with one or more modules (no comms)
  • Sometimes vehicle may start fine then develop faults while driving

What to check

  • Read all stored and pending DTCs from all modules; note freeze frame and timestamps
  • Check battery voltage and charging system under load
  • Visually inspect CAN connectors for corrosion, bent pins, water ingress
  • Wiggle test wiring harness around TCM/ABS while monitoring for changes in communication
  • Verify module power and ground circuits (voltage and continuity checks)
  • Measure CAN bus idle voltages on CAN-H and CAN-L with key on, engine off

Signal parameters

  • CAN bus idle voltages: CAN-H ~2.5V, CAN-L ~2.5V (each), differential ~0V when recessive
  • Dominant state: CAN-H rises toward ~3.5V and CAN-L falls toward ~1.5V, differential ~2.0V during frames
  • Normal bus termination: two 120 Ω resistors in parallel ≈ 60 Ω across CAN-H and CAN-L
  • Common data rates: 250 kbps or 500 kbps depending on vehicle network segment (verify factory spec)
  • Oscilloscope will show regular CAN frames; noise, missing frames, or distorted edges indicate faults

Diagnostic algorithm

  1. Use a full-function scan tool to read all modules; log P1799 plus any U-codes and freeze-frame data.
  2. Verify battery state-of-charge and charging. Low voltage can cause intermittent CAN faults—restore to normal before further testing.
  3. Visually inspect and reseat connectors at TCM, ABS module, and any junctions or gateway modules. Look for corrosion, bent pins, or moisture.
  4. Check fuses/power supplies and test module ground points for low resistance to chassis.
  5. With ignition ON, measure steady-state voltages at CAN-H and CAN-L at both TCM and ABS connectors. Compare readings to expected values.
  6. Measure resistance across CAN-H to CAN-L with key off; expect ~60 Ω across the whole bus. If open or very low, isolate sections to find fault.
  7. Use an oscilloscope or CAN bus analyzer to view waveform quality and message traffic. Look for missing frames, error flags, or dominant stuck bits.
  8. If wiring looks good, swap or bench-test suspect module only if manufacturer procedure allows. Follow Land Rover service manual for module reprogramming
  9. Clear codes and perform test drive to verify repair. If fault recurs, follow network isolation procedures to locate intermittent wiring or failing module.
  10. If intermittent and cannot be replicated, inspect for aftermarket devices, route harness chafing, and perform longer road tests with data logging.

Likely causes

  • Corroded or loose connector at TCM or ABS (common on Land Rover models)
  • Open or short in CAN wiring harness between modules
  • Missing/failed chassis ground or low battery voltage
  • Failed ABS module or TCM hardware
  • Faulty termination (open/shorted 60 Ω resistor pair) on CAN bus

Fault status

⚠️ Status
CAN transmission control module / module circuit fault ABS control — indicates loss or corruption of CAN messages between the Transmission Control Module and ABS control module; communication may be intermittent or permanent.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 2-4 hours

Similar codes

U0100 U0105 U0121 U0073 P0700
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Code

P1799

VOLKSWAGEN P — Powertrain

Output Speed Sensor 2 Circuit RPM Too High

Brand: VOLKSWAGEN
Type: P — Powertrain
Views: UK: 16 EN: 16 RU: 14
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Damaged or corroded CAN-H/CAN-L wiring or connectors between TCM and ABS
  • Faulty TCM, ABS module, or other module on same CAN segment
  • Poor or intermittent ground or battery supply to one or more modules
  • Blown fuse or poor power feed to modules
  • Water intrusion or corrosion in connectors
  • CAN bus termination resistor open or shorted

Symptoms

  • MIL/ABS warning lamp illuminated
  • Transmission enters limp/home mode or displays shift faults
  • Intermittent or permanent loss of ABS traction control or stability functions
  • Multiple CAN-related U-codes present
  • Erratic or lost communication with one or more modules (no comms)
  • Sometimes vehicle may start fine then develop faults while driving

What to check

  • Read all stored and pending DTCs from all modules; note freeze frame and timestamps
  • Check battery voltage and charging system under load
  • Visually inspect CAN connectors for corrosion, bent pins, water ingress
  • Wiggle test wiring harness around TCM/ABS while monitoring for changes in communication
  • Verify module power and ground circuits (voltage and continuity checks)
  • Measure CAN bus idle voltages on CAN-H and CAN-L with key on, engine off

Signal parameters

  • CAN bus idle voltages: CAN-H ~2.5V, CAN-L ~2.5V (each), differential ~0V when recessive
  • Dominant state: CAN-H rises toward ~3.5V and CAN-L falls toward ~1.5V, differential ~2.0V during frames
  • Normal bus termination: two 120 Ω resistors in parallel ≈ 60 Ω across CAN-H and CAN-L
  • Common data rates: 250 kbps or 500 kbps depending on vehicle network segment (verify factory spec)
  • Oscilloscope will show regular CAN frames; noise, missing frames, or distorted edges indicate faults

Diagnostic algorithm

  1. Use a full-function scan tool to read all modules; log P1799 plus any U-codes and freeze-frame data.
  2. Verify battery state-of-charge and charging. Low voltage can cause intermittent CAN faults—restore to normal before further testing.
  3. Visually inspect and reseat connectors at TCM, ABS module, and any junctions or gateway modules. Look for corrosion, bent pins, or moisture.
  4. Check fuses/power supplies and test module ground points for low resistance to chassis.
  5. With ignition ON, measure steady-state voltages at CAN-H and CAN-L at both TCM and ABS connectors. Compare readings to expected values.
  6. Measure resistance across CAN-H to CAN-L with key off; expect ~60 Ω across the whole bus. If open or very low, isolate sections to find fault.
  7. Use an oscilloscope or CAN bus analyzer to view waveform quality and message traffic. Look for missing frames, error flags, or dominant stuck bits.
  8. If wiring looks good, swap or bench-test suspect module only if manufacturer procedure allows. Follow Land Rover service manual for module reprogramming
  9. Clear codes and perform test drive to verify repair. If fault recurs, follow network isolation procedures to locate intermittent wiring or failing module.
  10. If intermittent and cannot be replicated, inspect for aftermarket devices, route harness chafing, and perform longer road tests with data logging.

Likely causes

  • Corroded or loose connector at TCM or ABS (common on Land Rover models)
  • Open or short in CAN wiring harness between modules
  • Missing/failed chassis ground or low battery voltage
  • Failed ABS module or TCM hardware
  • Faulty termination (open/shorted 60 Ω resistor pair) on CAN bus

Fault status

⚠️ Status
CAN transmission control module / module circuit fault ABS control — indicates loss or corruption of CAN messages between the Transmission Control Module and ABS control module; communication may be intermittent or permanent.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 2-4 hours

Similar codes

U0100 U0105 U0121 U0073 P0700
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email

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