Code
U1213
CITROEN
U — Network/User
Fault: absence of communication with the stability control (ESP) ECU: Value received incorrect
Views:
UK: 1
EN: 5
RU: 5
AI status
Completed
Completed
100%
Causes
- Broken or shorted CAN bus wiring (CAN high/low)
- Corroded, loose or damaged connector at the ESP ECU
- Blown fuse or interrupted power/ground to the ESP module
- ESP ECU hardware fault (internal failure)
- Software or configuration mismatch after module replacement or update
- Bus termination missing or incorrect (open/shorted 120 Ω)
Symptoms
- ESP / ASR / stability control warning lamp illuminated
- Loss of ESP/traction control functions or reduced functionality
- ABS-related warnings or degraded braking features
- Inability to communicate with ESP ECU using diagnostic tool
- Intermittent or persistent communication-related fault codes
- Other modules reporting CAN bus errors or multiple U-codes
What to check
- Read all stored codes and freeze-frame data with a capable OEM or dealer-level scanner
- Check for related U-codes (other control modules reporting lost comms)
- Verify battery voltage is stable (12.2–14.5 V) during tests
- Visually inspect the ESP ECU connector and wiring harness for damage, corrosion, or moisture
- Check fuses and relays supplying ESP power and ignition feeds
- Measure CAN bus termination resistance across CAN_H and CAN_L (≈60 Ω at each end; ≈120 Ω total)
Signal parameters
- CAN bus idle voltages: CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V (differential ≈ 0 V idle)
- CAN bus dominant state: CAN_H rises (~3.5 V), CAN_L falls (~1.5 V) on data bits (typical)
- Termination resistance between CAN_H and CAN_L ≈ 120 Ω (two 60 Ω terminators in parallel)
- Expected ESP status message: periodic broadcast on CAN (frequency depends on platform — often 5–50 Hz)
- Module supply: battery/ignition feed ≈ 12 V (check actual pin voltage with ignition on)
- Ground continuity: module chassis/ground pin should be low resistance (
Diagnostic algorithm
- Retrieve and record all current and historic DTCs and freeze-frame data. Note related U-codes and module availability.
- Confirm inability to communicate with the ESP ECU using an OEM-level scan tool; attempt a re-scan with ignition cycles.
- Verify battery voltage and stabilise battery if low. Recharge or support with stable power during testing.
- Inspect ESP module connector for bent pins, corrosion, water ingress or damage. Repair or clean as needed.
- Check fuses/relays supplying the ESP module and verify power/ground at the ECU pins with a multimeter.
- Measure CAN bus termination resistance and check for opens/shorts to chassis or battery using wiring diagrams to locate harness sections.
- Use an oscilloscope or CAN bus analyzer to view CAN_H/CAN_L waveforms at the ESP connector while turning ignition on and requesting data; look for correct idle voltages and message activity.
- If bus shows no activity, trace wiring back to nearest gateway or junction to find break or short. Perform continuity and short-to-power/ground checks on CAN pairs.
- If intermittent, perform wiggle tests and stress harness sections while monitoring for message dropouts or error frames.
- If wiring, power and ground are verified good but communication still fails, check for software mismatch. Re-flash or update module software per OEM service procedure if available.
- Replace the ESP ECU only after confirming failure with bench or vehicle diagnostics and ensuring programming/encoding can be performed. Clear codes and verify system operation.
- After repair, road test and re-scan to confirm no reoccurrence and that related modules regained normal communication.
Likely causes
- Damaged connector or pin corrosion at the ESP ECU
- Open/short in CAN_H or CAN_L between ESP ECU and CAN bus
- ESP module has lost power or ground
- Module is in bus-off state or has faulty transceiver
- Recent module replacement without correct programming or parameterization
Fault status
Status
Absence of communication with ESP ECU — invalid or missing value received from stability control module (CAN bus communication fault).
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
U1213
DS
U — Network/User
Fault: absence of communication with the stability control (ESP) ECU: Value received incorrect
Views:
UK: 1
EN: 2
RU: 3
AI status
Completed
Completed
100%
Causes
- Broken or shorted CAN bus wiring (CAN high/low)
- Corroded, loose or damaged connector at the ESP ECU
- Blown fuse or interrupted power/ground to the ESP module
- ESP ECU hardware fault (internal failure)
- Software or configuration mismatch after module replacement or update
- Bus termination missing or incorrect (open/shorted 120 Ω)
Symptoms
- ESP / ASR / stability control warning lamp illuminated
- Loss of ESP/traction control functions or reduced functionality
- ABS-related warnings or degraded braking features
- Inability to communicate with ESP ECU using diagnostic tool
- Intermittent or persistent communication-related fault codes
- Other modules reporting CAN bus errors or multiple U-codes
What to check
- Read all stored codes and freeze-frame data with a capable OEM or dealer-level scanner
- Check for related U-codes (other control modules reporting lost comms)
- Verify battery voltage is stable (12.2–14.5 V) during tests
- Visually inspect the ESP ECU connector and wiring harness for damage, corrosion, or moisture
- Check fuses and relays supplying ESP power and ignition feeds
- Measure CAN bus termination resistance across CAN_H and CAN_L (≈60 Ω at each end; ≈120 Ω total)
Signal parameters
- CAN bus idle voltages: CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V (differential ≈ 0 V idle)
- CAN bus dominant state: CAN_H rises (~3.5 V), CAN_L falls (~1.5 V) on data bits (typical)
- Termination resistance between CAN_H and CAN_L ≈ 120 Ω (two 60 Ω terminators in parallel)
- Expected ESP status message: periodic broadcast on CAN (frequency depends on platform — often 5–50 Hz)
- Module supply: battery/ignition feed ≈ 12 V (check actual pin voltage with ignition on)
- Ground continuity: module chassis/ground pin should be low resistance (
Diagnostic algorithm
- Retrieve and record all current and historic DTCs and freeze-frame data. Note related U-codes and module availability.
- Confirm inability to communicate with the ESP ECU using an OEM-level scan tool; attempt a re-scan with ignition cycles.
- Verify battery voltage and stabilise battery if low. Recharge or support with stable power during testing.
- Inspect ESP module connector for bent pins, corrosion, water ingress or damage. Repair or clean as needed.
- Check fuses/relays supplying the ESP module and verify power/ground at the ECU pins with a multimeter.
- Measure CAN bus termination resistance and check for opens/shorts to chassis or battery using wiring diagrams to locate harness sections.
- Use an oscilloscope or CAN bus analyzer to view CAN_H/CAN_L waveforms at the ESP connector while turning ignition on and requesting data; look for correct idle voltages and message activity.
- If bus shows no activity, trace wiring back to nearest gateway or junction to find break or short. Perform continuity and short-to-power/ground checks on CAN pairs.
- If intermittent, perform wiggle tests and stress harness sections while monitoring for message dropouts or error frames.
- If wiring, power and ground are verified good but communication still fails, check for software mismatch. Re-flash or update module software per OEM service procedure if available.
- Replace the ESP ECU only after confirming failure with bench or vehicle diagnostics and ensuring programming/encoding can be performed. Clear codes and verify system operation.
- After repair, road test and re-scan to confirm no reoccurrence and that related modules regained normal communication.
Likely causes
- Damaged connector or pin corrosion at the ESP ECU
- Open/short in CAN_H or CAN_L between ESP ECU and CAN bus
- ESP module has lost power or ground
- Module is in bus-off state or has faulty transceiver
- Recent module replacement without correct programming or parameterization
Fault status
Status
Absence of communication with ESP ECU — invalid or missing value received from stability control module (CAN bus communication fault).
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
U1213
Other
U — Network/User
SCP (J1850) Invalid or Missing Data for Primary Id
Views:
UK: 20
EN: 21
RU: 22
AI status
Completed
Completed
100%
Causes
- Broken or shorted CAN bus wiring (CAN high/low)
- Corroded, loose or damaged connector at the ESP ECU
- Blown fuse or interrupted power/ground to the ESP module
- ESP ECU hardware fault (internal failure)
- Software or configuration mismatch after module replacement or update
- Bus termination missing or incorrect (open/shorted 120 Ω)
Symptoms
- ESP / ASR / stability control warning lamp illuminated
- Loss of ESP/traction control functions or reduced functionality
- ABS-related warnings or degraded braking features
- Inability to communicate with ESP ECU using diagnostic tool
- Intermittent or persistent communication-related fault codes
- Other modules reporting CAN bus errors or multiple U-codes
What to check
- Read all stored codes and freeze-frame data with a capable OEM or dealer-level scanner
- Check for related U-codes (other control modules reporting lost comms)
- Verify battery voltage is stable (12.2–14.5 V) during tests
- Visually inspect the ESP ECU connector and wiring harness for damage, corrosion, or moisture
- Check fuses and relays supplying ESP power and ignition feeds
- Measure CAN bus termination resistance across CAN_H and CAN_L (≈60 Ω at each end; ≈120 Ω total)
Signal parameters
- CAN bus idle voltages: CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V (differential ≈ 0 V idle)
- CAN bus dominant state: CAN_H rises (~3.5 V), CAN_L falls (~1.5 V) on data bits (typical)
- Termination resistance between CAN_H and CAN_L ≈ 120 Ω (two 60 Ω terminators in parallel)
- Expected ESP status message: periodic broadcast on CAN (frequency depends on platform — often 5–50 Hz)
- Module supply: battery/ignition feed ≈ 12 V (check actual pin voltage with ignition on)
- Ground continuity: module chassis/ground pin should be low resistance (
Diagnostic algorithm
- Retrieve and record all current and historic DTCs and freeze-frame data. Note related U-codes and module availability.
- Confirm inability to communicate with the ESP ECU using an OEM-level scan tool; attempt a re-scan with ignition cycles.
- Verify battery voltage and stabilise battery if low. Recharge or support with stable power during testing.
- Inspect ESP module connector for bent pins, corrosion, water ingress or damage. Repair or clean as needed.
- Check fuses/relays supplying the ESP module and verify power/ground at the ECU pins with a multimeter.
- Measure CAN bus termination resistance and check for opens/shorts to chassis or battery using wiring diagrams to locate harness sections.
- Use an oscilloscope or CAN bus analyzer to view CAN_H/CAN_L waveforms at the ESP connector while turning ignition on and requesting data; look for correct idle voltages and message activity.
- If bus shows no activity, trace wiring back to nearest gateway or junction to find break or short. Perform continuity and short-to-power/ground checks on CAN pairs.
- If intermittent, perform wiggle tests and stress harness sections while monitoring for message dropouts or error frames.
- If wiring, power and ground are verified good but communication still fails, check for software mismatch. Re-flash or update module software per OEM service procedure if available.
- Replace the ESP ECU only after confirming failure with bench or vehicle diagnostics and ensuring programming/encoding can be performed. Clear codes and verify system operation.
- After repair, road test and re-scan to confirm no reoccurrence and that related modules regained normal communication.
Likely causes
- Damaged connector or pin corrosion at the ESP ECU
- Open/short in CAN_H or CAN_L between ESP ECU and CAN bus
- ESP module has lost power or ground
- Module is in bus-off state or has faulty transceiver
- Recent module replacement without correct programming or parameterization
Fault status
Status
Absence of communication with ESP ECU — invalid or missing value received from stability control module (CAN bus communication fault).
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
U1213
PEUGEOT
U — Network/User
Fault: absence of communication with the stability control (ESP) ECU: Value received incorrect
Views:
UK: 1
EN: 1
RU: 3
AI status
Completed
Completed
100%
Causes
- Broken or shorted CAN bus wiring (CAN high/low)
- Corroded, loose or damaged connector at the ESP ECU
- Blown fuse or interrupted power/ground to the ESP module
- ESP ECU hardware fault (internal failure)
- Software or configuration mismatch after module replacement or update
- Bus termination missing or incorrect (open/shorted 120 Ω)
Symptoms
- ESP / ASR / stability control warning lamp illuminated
- Loss of ESP/traction control functions or reduced functionality
- ABS-related warnings or degraded braking features
- Inability to communicate with ESP ECU using diagnostic tool
- Intermittent or persistent communication-related fault codes
- Other modules reporting CAN bus errors or multiple U-codes
What to check
- Read all stored codes and freeze-frame data with a capable OEM or dealer-level scanner
- Check for related U-codes (other control modules reporting lost comms)
- Verify battery voltage is stable (12.2–14.5 V) during tests
- Visually inspect the ESP ECU connector and wiring harness for damage, corrosion, or moisture
- Check fuses and relays supplying ESP power and ignition feeds
- Measure CAN bus termination resistance across CAN_H and CAN_L (≈60 Ω at each end; ≈120 Ω total)
Signal parameters
- CAN bus idle voltages: CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V (differential ≈ 0 V idle)
- CAN bus dominant state: CAN_H rises (~3.5 V), CAN_L falls (~1.5 V) on data bits (typical)
- Termination resistance between CAN_H and CAN_L ≈ 120 Ω (two 60 Ω terminators in parallel)
- Expected ESP status message: periodic broadcast on CAN (frequency depends on platform — often 5–50 Hz)
- Module supply: battery/ignition feed ≈ 12 V (check actual pin voltage with ignition on)
- Ground continuity: module chassis/ground pin should be low resistance (
Diagnostic algorithm
- Retrieve and record all current and historic DTCs and freeze-frame data. Note related U-codes and module availability.
- Confirm inability to communicate with the ESP ECU using an OEM-level scan tool; attempt a re-scan with ignition cycles.
- Verify battery voltage and stabilise battery if low. Recharge or support with stable power during testing.
- Inspect ESP module connector for bent pins, corrosion, water ingress or damage. Repair or clean as needed.
- Check fuses/relays supplying the ESP module and verify power/ground at the ECU pins with a multimeter.
- Measure CAN bus termination resistance and check for opens/shorts to chassis or battery using wiring diagrams to locate harness sections.
- Use an oscilloscope or CAN bus analyzer to view CAN_H/CAN_L waveforms at the ESP connector while turning ignition on and requesting data; look for correct idle voltages and message activity.
- If bus shows no activity, trace wiring back to nearest gateway or junction to find break or short. Perform continuity and short-to-power/ground checks on CAN pairs.
- If intermittent, perform wiggle tests and stress harness sections while monitoring for message dropouts or error frames.
- If wiring, power and ground are verified good but communication still fails, check for software mismatch. Re-flash or update module software per OEM service procedure if available.
- Replace the ESP ECU only after confirming failure with bench or vehicle diagnostics and ensuring programming/encoding can be performed. Clear codes and verify system operation.
- After repair, road test and re-scan to confirm no reoccurrence and that related modules regained normal communication.
Likely causes
- Damaged connector or pin corrosion at the ESP ECU
- Open/short in CAN_H or CAN_L between ESP ECU and CAN bus
- ESP module has lost power or ground
- Module is in bus-off state or has faulty transceiver
- Recent module replacement without correct programming or parameterization
Fault status
Status
Absence of communication with ESP ECU — invalid or missing value received from stability control module (CAN bus communication fault).
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
Similar codes
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