Code
P1704
ALFA ROMEO
P — Powertrain
Autotransmission | Secondary pressure sensor
Views:
UK: 19
EN: 36
RU: 25
AI status
Completed
Completed
100%
Causes
- Faulty secondary (line) pressure sensor
- Damaged, corroded or disconnected wiring/connector to the sensor
- Poor sensor ground or lost reference/5V supply from TCM
- Hydraulic issue (blocked/contaminated pressure port, internal valve body leak)
- Faulty TCM (rare) or software/calibration fault
- Incorrect transmission fluid level or severely degraded fluid affecting pressure readings
Symptoms
- MIL (Check Engine/Transmission warning) illuminated
- Harsh, delayed or erratic gear shifts
- Transmission slipping or failing to engage certain gears
- Vehicle may enter limp-home mode with limited gear selection
- Transmission-related fault messages displayed in cluster
- Unusual transmission noise or degraded driveability
What to check
- Read freeze frame and live data with a capable scan tool; note secondary pressure sensor values, related flags, and transmission temperature
- Visual inspection of sensor connector and wiring for corrosion, damage, pin push-out or fluid ingress
- Backprobe sensor connector and measure signal voltage with key ON / engine OFF and while running (observe change with throttle if safe)
- Verify reference supply (usually 5V) and ground integrity at the sensor connector
- Check for shorts to battery or ground using a multimeter and continuity tests
- If available, attach an external transmission pressure gauge to compare hydraulic pressure with sensor readings
Signal parameters
- Typical sensor output: ~0.5–4.5 V proportional to measured pressure (manufacturer-specific curve — consult Alfa Romeo spec)
- Reference supply: 5 V (approx.) from TCM; confirm stable 4.8–5.2 V at connector
- Ground: low resistance (
- Expected dynamic behavior: signal changes smoothly with throttle/gear changes; no rapid spikes or dropouts
- If using an absolute pressure scale: secondary/line pressure may typically range from 0–15 bar depending on gear and throttle (use factory spec for exact values)
Diagnostic algorithm
- Retrieve and record all related DTCs, freeze frame and live data (secondary pressure, primary pressure, transmission temp, speed sensors).
- Visually inspect the secondary pressure sensor, connector and harness for damage, fluid contamination or corrosion. Repair connector issues if found.
- With key ON engine OFF, backprobe the sensor connector: verify presence of reference voltage (≈5 V) and good ground. If absent, trace to TCM.
- Start engine and monitor sensor output voltage; observe whether signal varies smoothly with throttle and gear changes. Check for intermittent behavior while gently moving harness to reproduce fault.
- If electrical supply/ground are good but signal is out of range or erratic, disconnect sensor and measure its output/resistance per factory procedure — replace sensor if out of spec.
- If sensor reads plausible but transmission behavior or pressure does not match, connect a mechanical transmission pressure gauge to the secondary pressure port and compare actual hydraulic pressure to sensor reading.
- If mechanical pressure is correct but sensor/TCM disagrees, suspect sensor or wiring; if mechanical pressure is incorrect, inspect valve body, solenoids and hydraulic circuits for blockage/leak.
- Check for TCM software updates or known technical service bulletins. If all wiring and sensor tests are good and issue persists, consider TCM fault (confirm with bench or swap tests if available).
- After repairs, clear codes and perform a road test while monitoring live data to confirm the fault is resolved.
Likely causes
- Open or short in sensor harness (connector corrosion or broken wire)
- Sensor electrical failure (out-of-range voltage or internal short)
- Contaminated hydraulic port at sensor or internal valve-body problem causing abnormal pressure
- Intermittent ground or supply from TCM causing implausible sensor voltage
Fault status
Status
Secondary pressure sensor circuit - implausible/invalid signal detected. Transmission control module has flagged the secondary pressure sensor circuit and may limit transmission operation until the condition is corrected.
Repair difficulty: Medium
Diagnostic time: 0.5–2.0 hours
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Code
P1704
DAEWOO
P — Powertrain
Tps -high input
Views:
UK: 18
EN: 47
RU: 25
AI status
Completed
Completed
100%
Causes
- Faulty secondary (line) pressure sensor
- Damaged, corroded or disconnected wiring/connector to the sensor
- Poor sensor ground or lost reference/5V supply from TCM
- Hydraulic issue (blocked/contaminated pressure port, internal valve body leak)
- Faulty TCM (rare) or software/calibration fault
- Incorrect transmission fluid level or severely degraded fluid affecting pressure readings
Symptoms
- MIL (Check Engine/Transmission warning) illuminated
- Harsh, delayed or erratic gear shifts
- Transmission slipping or failing to engage certain gears
- Vehicle may enter limp-home mode with limited gear selection
- Transmission-related fault messages displayed in cluster
- Unusual transmission noise or degraded driveability
What to check
- Read freeze frame and live data with a capable scan tool; note secondary pressure sensor values, related flags, and transmission temperature
- Visual inspection of sensor connector and wiring for corrosion, damage, pin push-out or fluid ingress
- Backprobe sensor connector and measure signal voltage with key ON / engine OFF and while running (observe change with throttle if safe)
- Verify reference supply (usually 5V) and ground integrity at the sensor connector
- Check for shorts to battery or ground using a multimeter and continuity tests
- If available, attach an external transmission pressure gauge to compare hydraulic pressure with sensor readings
Signal parameters
- Typical sensor output: ~0.5–4.5 V proportional to measured pressure (manufacturer-specific curve — consult Alfa Romeo spec)
- Reference supply: 5 V (approx.) from TCM; confirm stable 4.8–5.2 V at connector
- Ground: low resistance (
- Expected dynamic behavior: signal changes smoothly with throttle/gear changes; no rapid spikes or dropouts
- If using an absolute pressure scale: secondary/line pressure may typically range from 0–15 bar depending on gear and throttle (use factory spec for exact values)
Diagnostic algorithm
- Retrieve and record all related DTCs, freeze frame and live data (secondary pressure, primary pressure, transmission temp, speed sensors).
- Visually inspect the secondary pressure sensor, connector and harness for damage, fluid contamination or corrosion. Repair connector issues if found.
- With key ON engine OFF, backprobe the sensor connector: verify presence of reference voltage (≈5 V) and good ground. If absent, trace to TCM.
- Start engine and monitor sensor output voltage; observe whether signal varies smoothly with throttle and gear changes. Check for intermittent behavior while gently moving harness to reproduce fault.
- If electrical supply/ground are good but signal is out of range or erratic, disconnect sensor and measure its output/resistance per factory procedure — replace sensor if out of spec.
- If sensor reads plausible but transmission behavior or pressure does not match, connect a mechanical transmission pressure gauge to the secondary pressure port and compare actual hydraulic pressure to sensor reading.
- If mechanical pressure is correct but sensor/TCM disagrees, suspect sensor or wiring; if mechanical pressure is incorrect, inspect valve body, solenoids and hydraulic circuits for blockage/leak.
- Check for TCM software updates or known technical service bulletins. If all wiring and sensor tests are good and issue persists, consider TCM fault (confirm with bench or swap tests if available).
- After repairs, clear codes and perform a road test while monitoring live data to confirm the fault is resolved.
Likely causes
- Open or short in sensor harness (connector corrosion or broken wire)
- Sensor electrical failure (out-of-range voltage or internal short)
- Contaminated hydraulic port at sensor or internal valve-body problem causing abnormal pressure
- Intermittent ground or supply from TCM causing implausible sensor voltage
Fault status
Status
Secondary pressure sensor circuit - implausible/invalid signal detected. Transmission control module has flagged the secondary pressure sensor circuit and may limit transmission operation until the condition is corrected.
Repair difficulty: Medium
Diagnostic time: 0.5–2.0 hours
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Code
P1704
DAIHATSU
P — Powertrain
Shift gear switch circuit short
Views:
UK: 19
EN: 36
RU: 22
AI status
Completed
Completed
100%
Causes
- Faulty secondary (line) pressure sensor
- Damaged, corroded or disconnected wiring/connector to the sensor
- Poor sensor ground or lost reference/5V supply from TCM
- Hydraulic issue (blocked/contaminated pressure port, internal valve body leak)
- Faulty TCM (rare) or software/calibration fault
- Incorrect transmission fluid level or severely degraded fluid affecting pressure readings
Symptoms
- MIL (Check Engine/Transmission warning) illuminated
- Harsh, delayed or erratic gear shifts
- Transmission slipping or failing to engage certain gears
- Vehicle may enter limp-home mode with limited gear selection
- Transmission-related fault messages displayed in cluster
- Unusual transmission noise or degraded driveability
What to check
- Read freeze frame and live data with a capable scan tool; note secondary pressure sensor values, related flags, and transmission temperature
- Visual inspection of sensor connector and wiring for corrosion, damage, pin push-out or fluid ingress
- Backprobe sensor connector and measure signal voltage with key ON / engine OFF and while running (observe change with throttle if safe)
- Verify reference supply (usually 5V) and ground integrity at the sensor connector
- Check for shorts to battery or ground using a multimeter and continuity tests
- If available, attach an external transmission pressure gauge to compare hydraulic pressure with sensor readings
Signal parameters
- Typical sensor output: ~0.5–4.5 V proportional to measured pressure (manufacturer-specific curve — consult Alfa Romeo spec)
- Reference supply: 5 V (approx.) from TCM; confirm stable 4.8–5.2 V at connector
- Ground: low resistance (
- Expected dynamic behavior: signal changes smoothly with throttle/gear changes; no rapid spikes or dropouts
- If using an absolute pressure scale: secondary/line pressure may typically range from 0–15 bar depending on gear and throttle (use factory spec for exact values)
Diagnostic algorithm
- Retrieve and record all related DTCs, freeze frame and live data (secondary pressure, primary pressure, transmission temp, speed sensors).
- Visually inspect the secondary pressure sensor, connector and harness for damage, fluid contamination or corrosion. Repair connector issues if found.
- With key ON engine OFF, backprobe the sensor connector: verify presence of reference voltage (≈5 V) and good ground. If absent, trace to TCM.
- Start engine and monitor sensor output voltage; observe whether signal varies smoothly with throttle and gear changes. Check for intermittent behavior while gently moving harness to reproduce fault.
- If electrical supply/ground are good but signal is out of range or erratic, disconnect sensor and measure its output/resistance per factory procedure — replace sensor if out of spec.
- If sensor reads plausible but transmission behavior or pressure does not match, connect a mechanical transmission pressure gauge to the secondary pressure port and compare actual hydraulic pressure to sensor reading.
- If mechanical pressure is correct but sensor/TCM disagrees, suspect sensor or wiring; if mechanical pressure is incorrect, inspect valve body, solenoids and hydraulic circuits for blockage/leak.
- Check for TCM software updates or known technical service bulletins. If all wiring and sensor tests are good and issue persists, consider TCM fault (confirm with bench or swap tests if available).
- After repairs, clear codes and perform a road test while monitoring live data to confirm the fault is resolved.
Likely causes
- Open or short in sensor harness (connector corrosion or broken wire)
- Sensor electrical failure (out-of-range voltage or internal short)
- Contaminated hydraulic port at sensor or internal valve-body problem causing abnormal pressure
- Intermittent ground or supply from TCM causing implausible sensor voltage
Fault status
Status
Secondary pressure sensor circuit - implausible/invalid signal detected. Transmission control module has flagged the secondary pressure sensor circuit and may limit transmission operation until the condition is corrected.
Repair difficulty: Medium
Diagnostic time: 0.5–2.0 hours
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Code
P1704
FIAT
P — Powertrain
Autotransmission | Secondary pressure sensor
Views:
UK: 18
EN: 42
RU: 27
AI status
Completed
Completed
100%
Causes
- Faulty secondary (line) pressure sensor
- Damaged, corroded or disconnected wiring/connector to the sensor
- Poor sensor ground or lost reference/5V supply from TCM
- Hydraulic issue (blocked/contaminated pressure port, internal valve body leak)
- Faulty TCM (rare) or software/calibration fault
- Incorrect transmission fluid level or severely degraded fluid affecting pressure readings
Symptoms
- MIL (Check Engine/Transmission warning) illuminated
- Harsh, delayed or erratic gear shifts
- Transmission slipping or failing to engage certain gears
- Vehicle may enter limp-home mode with limited gear selection
- Transmission-related fault messages displayed in cluster
- Unusual transmission noise or degraded driveability
What to check
- Read freeze frame and live data with a capable scan tool; note secondary pressure sensor values, related flags, and transmission temperature
- Visual inspection of sensor connector and wiring for corrosion, damage, pin push-out or fluid ingress
- Backprobe sensor connector and measure signal voltage with key ON / engine OFF and while running (observe change with throttle if safe)
- Verify reference supply (usually 5V) and ground integrity at the sensor connector
- Check for shorts to battery or ground using a multimeter and continuity tests
- If available, attach an external transmission pressure gauge to compare hydraulic pressure with sensor readings
Signal parameters
- Typical sensor output: ~0.5–4.5 V proportional to measured pressure (manufacturer-specific curve — consult Alfa Romeo spec)
- Reference supply: 5 V (approx.) from TCM; confirm stable 4.8–5.2 V at connector
- Ground: low resistance (
- Expected dynamic behavior: signal changes smoothly with throttle/gear changes; no rapid spikes or dropouts
- If using an absolute pressure scale: secondary/line pressure may typically range from 0–15 bar depending on gear and throttle (use factory spec for exact values)
Diagnostic algorithm
- Retrieve and record all related DTCs, freeze frame and live data (secondary pressure, primary pressure, transmission temp, speed sensors).
- Visually inspect the secondary pressure sensor, connector and harness for damage, fluid contamination or corrosion. Repair connector issues if found.
- With key ON engine OFF, backprobe the sensor connector: verify presence of reference voltage (≈5 V) and good ground. If absent, trace to TCM.
- Start engine and monitor sensor output voltage; observe whether signal varies smoothly with throttle and gear changes. Check for intermittent behavior while gently moving harness to reproduce fault.
- If electrical supply/ground are good but signal is out of range or erratic, disconnect sensor and measure its output/resistance per factory procedure — replace sensor if out of spec.
- If sensor reads plausible but transmission behavior or pressure does not match, connect a mechanical transmission pressure gauge to the secondary pressure port and compare actual hydraulic pressure to sensor reading.
- If mechanical pressure is correct but sensor/TCM disagrees, suspect sensor or wiring; if mechanical pressure is incorrect, inspect valve body, solenoids and hydraulic circuits for blockage/leak.
- Check for TCM software updates or known technical service bulletins. If all wiring and sensor tests are good and issue persists, consider TCM fault (confirm with bench or swap tests if available).
- After repairs, clear codes and perform a road test while monitoring live data to confirm the fault is resolved.
Likely causes
- Open or short in sensor harness (connector corrosion or broken wire)
- Sensor electrical failure (out-of-range voltage or internal short)
- Contaminated hydraulic port at sensor or internal valve-body problem causing abnormal pressure
- Intermittent ground or supply from TCM causing implausible sensor voltage
Fault status
Status
Secondary pressure sensor circuit - implausible/invalid signal detected. Transmission control module has flagged the secondary pressure sensor circuit and may limit transmission operation until the condition is corrected.
Repair difficulty: Medium
Diagnostic time: 0.5–2.0 hours
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Code
P1704
FORD
P — Powertrain
Transmission system problems
Views:
UK: 36
EN: 69
RU: 35
AI status
Completed
Completed
100%
Causes
- Faulty secondary (line) pressure sensor
- Damaged, corroded or disconnected wiring/connector to the sensor
- Poor sensor ground or lost reference/5V supply from TCM
- Hydraulic issue (blocked/contaminated pressure port, internal valve body leak)
- Faulty TCM (rare) or software/calibration fault
- Incorrect transmission fluid level or severely degraded fluid affecting pressure readings
Symptoms
- MIL (Check Engine/Transmission warning) illuminated
- Harsh, delayed or erratic gear shifts
- Transmission slipping or failing to engage certain gears
- Vehicle may enter limp-home mode with limited gear selection
- Transmission-related fault messages displayed in cluster
- Unusual transmission noise or degraded driveability
What to check
- Read freeze frame and live data with a capable scan tool; note secondary pressure sensor values, related flags, and transmission temperature
- Visual inspection of sensor connector and wiring for corrosion, damage, pin push-out or fluid ingress
- Backprobe sensor connector and measure signal voltage with key ON / engine OFF and while running (observe change with throttle if safe)
- Verify reference supply (usually 5V) and ground integrity at the sensor connector
- Check for shorts to battery or ground using a multimeter and continuity tests
- If available, attach an external transmission pressure gauge to compare hydraulic pressure with sensor readings
Signal parameters
- Typical sensor output: ~0.5–4.5 V proportional to measured pressure (manufacturer-specific curve — consult Alfa Romeo spec)
- Reference supply: 5 V (approx.) from TCM; confirm stable 4.8–5.2 V at connector
- Ground: low resistance (
- Expected dynamic behavior: signal changes smoothly with throttle/gear changes; no rapid spikes or dropouts
- If using an absolute pressure scale: secondary/line pressure may typically range from 0–15 bar depending on gear and throttle (use factory spec for exact values)
Diagnostic algorithm
- Retrieve and record all related DTCs, freeze frame and live data (secondary pressure, primary pressure, transmission temp, speed sensors).
- Visually inspect the secondary pressure sensor, connector and harness for damage, fluid contamination or corrosion. Repair connector issues if found.
- With key ON engine OFF, backprobe the sensor connector: verify presence of reference voltage (≈5 V) and good ground. If absent, trace to TCM.
- Start engine and monitor sensor output voltage; observe whether signal varies smoothly with throttle and gear changes. Check for intermittent behavior while gently moving harness to reproduce fault.
- If electrical supply/ground are good but signal is out of range or erratic, disconnect sensor and measure its output/resistance per factory procedure — replace sensor if out of spec.
- If sensor reads plausible but transmission behavior or pressure does not match, connect a mechanical transmission pressure gauge to the secondary pressure port and compare actual hydraulic pressure to sensor reading.
- If mechanical pressure is correct but sensor/TCM disagrees, suspect sensor or wiring; if mechanical pressure is incorrect, inspect valve body, solenoids and hydraulic circuits for blockage/leak.
- Check for TCM software updates or known technical service bulletins. If all wiring and sensor tests are good and issue persists, consider TCM fault (confirm with bench or swap tests if available).
- After repairs, clear codes and perform a road test while monitoring live data to confirm the fault is resolved.
Likely causes
- Open or short in sensor harness (connector corrosion or broken wire)
- Sensor electrical failure (out-of-range voltage or internal short)
- Contaminated hydraulic port at sensor or internal valve-body problem causing abnormal pressure
- Intermittent ground or supply from TCM causing implausible sensor voltage
Fault status
Status
Secondary pressure sensor circuit - implausible/invalid signal detected. Transmission control module has flagged the secondary pressure sensor circuit and may limit transmission operation until the condition is corrected.
Repair difficulty: Medium
Diagnostic time: 0.5–2.0 hours
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Code
P1704
LAND ROVER
P — Powertrain
Rotary switch failed to transition state
Views:
UK: 20
EN: 37
RU: 23
AI status
Completed
Completed
100%
Causes
- Faulty secondary (line) pressure sensor
- Damaged, corroded or disconnected wiring/connector to the sensor
- Poor sensor ground or lost reference/5V supply from TCM
- Hydraulic issue (blocked/contaminated pressure port, internal valve body leak)
- Faulty TCM (rare) or software/calibration fault
- Incorrect transmission fluid level or severely degraded fluid affecting pressure readings
Symptoms
- MIL (Check Engine/Transmission warning) illuminated
- Harsh, delayed or erratic gear shifts
- Transmission slipping or failing to engage certain gears
- Vehicle may enter limp-home mode with limited gear selection
- Transmission-related fault messages displayed in cluster
- Unusual transmission noise or degraded driveability
What to check
- Read freeze frame and live data with a capable scan tool; note secondary pressure sensor values, related flags, and transmission temperature
- Visual inspection of sensor connector and wiring for corrosion, damage, pin push-out or fluid ingress
- Backprobe sensor connector and measure signal voltage with key ON / engine OFF and while running (observe change with throttle if safe)
- Verify reference supply (usually 5V) and ground integrity at the sensor connector
- Check for shorts to battery or ground using a multimeter and continuity tests
- If available, attach an external transmission pressure gauge to compare hydraulic pressure with sensor readings
Signal parameters
- Typical sensor output: ~0.5–4.5 V proportional to measured pressure (manufacturer-specific curve — consult Alfa Romeo spec)
- Reference supply: 5 V (approx.) from TCM; confirm stable 4.8–5.2 V at connector
- Ground: low resistance (
- Expected dynamic behavior: signal changes smoothly with throttle/gear changes; no rapid spikes or dropouts
- If using an absolute pressure scale: secondary/line pressure may typically range from 0–15 bar depending on gear and throttle (use factory spec for exact values)
Diagnostic algorithm
- Retrieve and record all related DTCs, freeze frame and live data (secondary pressure, primary pressure, transmission temp, speed sensors).
- Visually inspect the secondary pressure sensor, connector and harness for damage, fluid contamination or corrosion. Repair connector issues if found.
- With key ON engine OFF, backprobe the sensor connector: verify presence of reference voltage (≈5 V) and good ground. If absent, trace to TCM.
- Start engine and monitor sensor output voltage; observe whether signal varies smoothly with throttle and gear changes. Check for intermittent behavior while gently moving harness to reproduce fault.
- If electrical supply/ground are good but signal is out of range or erratic, disconnect sensor and measure its output/resistance per factory procedure — replace sensor if out of spec.
- If sensor reads plausible but transmission behavior or pressure does not match, connect a mechanical transmission pressure gauge to the secondary pressure port and compare actual hydraulic pressure to sensor reading.
- If mechanical pressure is correct but sensor/TCM disagrees, suspect sensor or wiring; if mechanical pressure is incorrect, inspect valve body, solenoids and hydraulic circuits for blockage/leak.
- Check for TCM software updates or known technical service bulletins. If all wiring and sensor tests are good and issue persists, consider TCM fault (confirm with bench or swap tests if available).
- After repairs, clear codes and perform a road test while monitoring live data to confirm the fault is resolved.
Likely causes
- Open or short in sensor harness (connector corrosion or broken wire)
- Sensor electrical failure (out-of-range voltage or internal short)
- Contaminated hydraulic port at sensor or internal valve-body problem causing abnormal pressure
- Intermittent ground or supply from TCM causing implausible sensor voltage
Fault status
Status
Secondary pressure sensor circuit - implausible/invalid signal detected. Transmission control module has flagged the secondary pressure sensor circuit and may limit transmission operation until the condition is corrected.
Repair difficulty: Medium
Diagnostic time: 0.5–2.0 hours
Similar codes
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Range Rover Evoque
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Range Rover Sport
- Autobiography, 2.0L Eng VIN Y · 2.0L Eng VIN Y2021: Range Rover Sport Autobiography
- Autobiography, 5.0L Eng VIN E · 5.0L Eng VIN E2021: Range Rover Sport Autobiography
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- Autobiography Dynamic, 5.0L Eng VIN E · 5.0L Eng VIN E2021: Range Rover Sport Autobiography Dynamic
- HSE Dynamic
- HSE Silver Edition, 2.0L Eng VIN Y · 2.0L Eng VIN Y2021: Range Rover Sport HSE Silver Edition
- HSE Silver Edition, 3.0L Eng VIN K · 3.0L Eng VIN K2021: Range Rover Sport HSE Silver Edition
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- HST
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Range Rover Velar
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LAND ROVER: 2020
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Discovery
- HSE, 3.0L Eng VIN K · 3.0L Eng VIN K2020: Discovery HSE
- HSE, 3.0L Eng VIN V · 3.0L Eng VIN V2020: Discovery HSE
- HSE Luxury, 3.0L Eng VIN K · 3.0L Eng VIN K2020: Discovery HSE Luxury
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- SE, 3.0L Eng VIN V · 3.0L Eng VIN V2020: Discovery SE
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Discovery Sport
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Range Rover
- Autobiography
- Base, 3.0L Eng VIN K · 3.0L Eng VIN K2020: Range Rover Base
- Base, 3.0L Eng VIN U · 3.0L Eng VIN U2020: Range Rover Base
- HSE, 2.0L Eng VIN Y · 2.0L Eng VIN Y2020: Range Rover HSE
- HSE, 3.0L Eng VIN K · 3.0L Eng VIN K2020: Range Rover HSE
- HSE, 3.0L Eng VIN U · 3.0L Eng VIN U2020: Range Rover HSE
- HSE, 5.0L Eng VIN E · 5.0L Eng VIN E2020: Range Rover HSE
- SVAutobiography
- SVAutobiography Dynamic
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Range Rover Evoque
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Range Rover Sport
- Autobiography Dynamic, 2.0L Eng VIN Y · 2.0L Eng VIN Y2020: Range Rover Sport Autobiography Dynamic
- Autobiography Dynamic, 5.0L Eng VIN E · 5.0L Eng VIN E2020: Range Rover Sport Autobiography Dynamic
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- HSE, 5.0L Eng VIN E · 5.0L Eng VIN E2020: Range Rover Sport HSE
- HSE Dynamic
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- SE, 3.0L Eng VIN U · 3.0L Eng VIN U2020: Range Rover Sport SE
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Range Rover Velar
- R-Dynamic HSE
- R-Dynamic S, 2.0L Eng VIN X · 2.0L Eng VIN X2020: Range Rover Velar R-Dynamic S
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LAND ROVER: 2019
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Code
P1704
LINCOLN
P — Powertrain
Transmission System Problems
Views:
UK: 39
EN: 72
RU: 46
AI status
Completed
Completed
100%
Causes
- Faulty secondary (line) pressure sensor
- Damaged, corroded or disconnected wiring/connector to the sensor
- Poor sensor ground or lost reference/5V supply from TCM
- Hydraulic issue (blocked/contaminated pressure port, internal valve body leak)
- Faulty TCM (rare) or software/calibration fault
- Incorrect transmission fluid level or severely degraded fluid affecting pressure readings
Symptoms
- MIL (Check Engine/Transmission warning) illuminated
- Harsh, delayed or erratic gear shifts
- Transmission slipping or failing to engage certain gears
- Vehicle may enter limp-home mode with limited gear selection
- Transmission-related fault messages displayed in cluster
- Unusual transmission noise or degraded driveability
What to check
- Read freeze frame and live data with a capable scan tool; note secondary pressure sensor values, related flags, and transmission temperature
- Visual inspection of sensor connector and wiring for corrosion, damage, pin push-out or fluid ingress
- Backprobe sensor connector and measure signal voltage with key ON / engine OFF and while running (observe change with throttle if safe)
- Verify reference supply (usually 5V) and ground integrity at the sensor connector
- Check for shorts to battery or ground using a multimeter and continuity tests
- If available, attach an external transmission pressure gauge to compare hydraulic pressure with sensor readings
Signal parameters
- Typical sensor output: ~0.5–4.5 V proportional to measured pressure (manufacturer-specific curve — consult Alfa Romeo spec)
- Reference supply: 5 V (approx.) from TCM; confirm stable 4.8–5.2 V at connector
- Ground: low resistance (
- Expected dynamic behavior: signal changes smoothly with throttle/gear changes; no rapid spikes or dropouts
- If using an absolute pressure scale: secondary/line pressure may typically range from 0–15 bar depending on gear and throttle (use factory spec for exact values)
Diagnostic algorithm
- Retrieve and record all related DTCs, freeze frame and live data (secondary pressure, primary pressure, transmission temp, speed sensors).
- Visually inspect the secondary pressure sensor, connector and harness for damage, fluid contamination or corrosion. Repair connector issues if found.
- With key ON engine OFF, backprobe the sensor connector: verify presence of reference voltage (≈5 V) and good ground. If absent, trace to TCM.
- Start engine and monitor sensor output voltage; observe whether signal varies smoothly with throttle and gear changes. Check for intermittent behavior while gently moving harness to reproduce fault.
- If electrical supply/ground are good but signal is out of range or erratic, disconnect sensor and measure its output/resistance per factory procedure — replace sensor if out of spec.
- If sensor reads plausible but transmission behavior or pressure does not match, connect a mechanical transmission pressure gauge to the secondary pressure port and compare actual hydraulic pressure to sensor reading.
- If mechanical pressure is correct but sensor/TCM disagrees, suspect sensor or wiring; if mechanical pressure is incorrect, inspect valve body, solenoids and hydraulic circuits for blockage/leak.
- Check for TCM software updates or known technical service bulletins. If all wiring and sensor tests are good and issue persists, consider TCM fault (confirm with bench or swap tests if available).
- After repairs, clear codes and perform a road test while monitoring live data to confirm the fault is resolved.
Likely causes
- Open or short in sensor harness (connector corrosion or broken wire)
- Sensor electrical failure (out-of-range voltage or internal short)
- Contaminated hydraulic port at sensor or internal valve-body problem causing abnormal pressure
- Intermittent ground or supply from TCM causing implausible sensor voltage
Fault status
Status
Secondary pressure sensor circuit - implausible/invalid signal detected. Transmission control module has flagged the secondary pressure sensor circuit and may limit transmission operation until the condition is corrected.
Repair difficulty: Medium
Diagnostic time: 0.5–2.0 hours
Similar codes
Repair manuals
Manual library for LINCOLN
122
Browse 122 LINCOLN manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.
LINCOLN
-
LINCOLN: 2023
-
Corsair
-
LINCOLN: 2022
-
LINCOLN: 2021
-
LINCOLN: 2020
-
Continental
- Base, AWD
- Base, FWD
- Black Label, 2.7L Eng VIN P · 2.7L Eng VIN P2020: Continental Black Label
- Black Label, 3.0L Eng VIN C · 3.0L Eng VIN C2020: Continental Black Label
- Livery, AWD
- Livery, FWD
- Reserve, 2.7L Eng VIN P, AWD
- Reserve, 2.7L Eng VIN P, FWD
- Reserve, 3.0L Eng VIN C · 3.0L Eng VIN C2020: Continental Reserve
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Code
P1704
MERCURY
P — Powertrain
Transmission system problems
Views:
UK: 37
EN: 88
RU: 36
AI status
Completed
Completed
100%
Causes
- Faulty secondary (line) pressure sensor
- Damaged, corroded or disconnected wiring/connector to the sensor
- Poor sensor ground or lost reference/5V supply from TCM
- Hydraulic issue (blocked/contaminated pressure port, internal valve body leak)
- Faulty TCM (rare) or software/calibration fault
- Incorrect transmission fluid level or severely degraded fluid affecting pressure readings
Symptoms
- MIL (Check Engine/Transmission warning) illuminated
- Harsh, delayed or erratic gear shifts
- Transmission slipping or failing to engage certain gears
- Vehicle may enter limp-home mode with limited gear selection
- Transmission-related fault messages displayed in cluster
- Unusual transmission noise or degraded driveability
What to check
- Read freeze frame and live data with a capable scan tool; note secondary pressure sensor values, related flags, and transmission temperature
- Visual inspection of sensor connector and wiring for corrosion, damage, pin push-out or fluid ingress
- Backprobe sensor connector and measure signal voltage with key ON / engine OFF and while running (observe change with throttle if safe)
- Verify reference supply (usually 5V) and ground integrity at the sensor connector
- Check for shorts to battery or ground using a multimeter and continuity tests
- If available, attach an external transmission pressure gauge to compare hydraulic pressure with sensor readings
Signal parameters
- Typical sensor output: ~0.5–4.5 V proportional to measured pressure (manufacturer-specific curve — consult Alfa Romeo spec)
- Reference supply: 5 V (approx.) from TCM; confirm stable 4.8–5.2 V at connector
- Ground: low resistance (
- Expected dynamic behavior: signal changes smoothly with throttle/gear changes; no rapid spikes or dropouts
- If using an absolute pressure scale: secondary/line pressure may typically range from 0–15 bar depending on gear and throttle (use factory spec for exact values)
Diagnostic algorithm
- Retrieve and record all related DTCs, freeze frame and live data (secondary pressure, primary pressure, transmission temp, speed sensors).
- Visually inspect the secondary pressure sensor, connector and harness for damage, fluid contamination or corrosion. Repair connector issues if found.
- With key ON engine OFF, backprobe the sensor connector: verify presence of reference voltage (≈5 V) and good ground. If absent, trace to TCM.
- Start engine and monitor sensor output voltage; observe whether signal varies smoothly with throttle and gear changes. Check for intermittent behavior while gently moving harness to reproduce fault.
- If electrical supply/ground are good but signal is out of range or erratic, disconnect sensor and measure its output/resistance per factory procedure — replace sensor if out of spec.
- If sensor reads plausible but transmission behavior or pressure does not match, connect a mechanical transmission pressure gauge to the secondary pressure port and compare actual hydraulic pressure to sensor reading.
- If mechanical pressure is correct but sensor/TCM disagrees, suspect sensor or wiring; if mechanical pressure is incorrect, inspect valve body, solenoids and hydraulic circuits for blockage/leak.
- Check for TCM software updates or known technical service bulletins. If all wiring and sensor tests are good and issue persists, consider TCM fault (confirm with bench or swap tests if available).
- After repairs, clear codes and perform a road test while monitoring live data to confirm the fault is resolved.
Likely causes
- Open or short in sensor harness (connector corrosion or broken wire)
- Sensor electrical failure (out-of-range voltage or internal short)
- Contaminated hydraulic port at sensor or internal valve-body problem causing abnormal pressure
- Intermittent ground or supply from TCM causing implausible sensor voltage
Fault status
Status
Secondary pressure sensor circuit - implausible/invalid signal detected. Transmission control module has flagged the secondary pressure sensor circuit and may limit transmission operation until the condition is corrected.
Repair difficulty: Medium
Diagnostic time: 0.5–2.0 hours
Similar codes
Repair manuals
Manual library for MERCURY
296
Browse 296 MERCURY manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.
MERCURY
-
MERCURY: 2011
-
MERCURY: 2010
-
Mountaineer
-
MERCURY: 2009
-
Mountaineer
-
MERCURY: 2008
-
Mountaineer
-
MERCURY: 2007
-
Montego
-
Monterey
-
Mountaineer
-
MERCURY: 2006
-
Montego
-
Monterey
-
Mountaineer
-
MERCURY: 2005
-
Grand Marquis
-
Mariner
-
Montego
-
Monterey
-
Mountaineer
-
-
MERCURY: 2004
-
Marauder
-
Monterey
-
Mountaineer
-
MERCURY: 2003
-
Marauder
-
Mountaineer
-
MERCURY: 2002
-
Cougar
-
Mountaineer
-
Sable
-
Villager
-
-
MERCURY: 2001
-
Mountaineer
-
Sable
- GS, 4D Sedan, 3.0 2, 4F50N
- GS, 4D Sedan, 3.0 2, AX4S
- GS, 4D Sedan, 3.0 S
- GS, 4D Sedan, 3.0 U, 4F50N
- GS, 4D Sedan, 3.0 U, AX4S
- GS, 4D Wagon, 3.0 2, 4F50N
- GS, 4D Wagon, 3.0 2, AX4S
- GS, 4D Wagon, 3.0 U, 4F50N
- GS, 4D Wagon, 3.0 U, AX4S
- LS, 4D Sedan, 3.0 2
- LS, 4D Sedan, 3.0 S
- LS, 4D Sedan, 3.0 U, 4F50N
- LS, 4D Sedan, 3.0 U, AX4S
- LS, 4D Wagon, 3.0 S
- LS, 4D Wagon, 3.0 U, 4F50N
- LS, 4D Wagon, 3.0 U, AX4S
-
Villager
-
MERCURY: 2000
-
Cougar
-
Mountaineer
-
Villager
-
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Code
P1704
Other
P — Powertrain
Digital TRS Failed to Transition States in KOEO / KOER
Views:
UK: 38
EN: 71
RU: 39
AI status
Completed
Completed
100%
Causes
- Faulty secondary (line) pressure sensor
- Damaged, corroded or disconnected wiring/connector to the sensor
- Poor sensor ground or lost reference/5V supply from TCM
- Hydraulic issue (blocked/contaminated pressure port, internal valve body leak)
- Faulty TCM (rare) or software/calibration fault
- Incorrect transmission fluid level or severely degraded fluid affecting pressure readings
Symptoms
- MIL (Check Engine/Transmission warning) illuminated
- Harsh, delayed or erratic gear shifts
- Transmission slipping or failing to engage certain gears
- Vehicle may enter limp-home mode with limited gear selection
- Transmission-related fault messages displayed in cluster
- Unusual transmission noise or degraded driveability
What to check
- Read freeze frame and live data with a capable scan tool; note secondary pressure sensor values, related flags, and transmission temperature
- Visual inspection of sensor connector and wiring for corrosion, damage, pin push-out or fluid ingress
- Backprobe sensor connector and measure signal voltage with key ON / engine OFF and while running (observe change with throttle if safe)
- Verify reference supply (usually 5V) and ground integrity at the sensor connector
- Check for shorts to battery or ground using a multimeter and continuity tests
- If available, attach an external transmission pressure gauge to compare hydraulic pressure with sensor readings
Signal parameters
- Typical sensor output: ~0.5–4.5 V proportional to measured pressure (manufacturer-specific curve — consult Alfa Romeo spec)
- Reference supply: 5 V (approx.) from TCM; confirm stable 4.8–5.2 V at connector
- Ground: low resistance (
- Expected dynamic behavior: signal changes smoothly with throttle/gear changes; no rapid spikes or dropouts
- If using an absolute pressure scale: secondary/line pressure may typically range from 0–15 bar depending on gear and throttle (use factory spec for exact values)
Diagnostic algorithm
- Retrieve and record all related DTCs, freeze frame and live data (secondary pressure, primary pressure, transmission temp, speed sensors).
- Visually inspect the secondary pressure sensor, connector and harness for damage, fluid contamination or corrosion. Repair connector issues if found.
- With key ON engine OFF, backprobe the sensor connector: verify presence of reference voltage (≈5 V) and good ground. If absent, trace to TCM.
- Start engine and monitor sensor output voltage; observe whether signal varies smoothly with throttle and gear changes. Check for intermittent behavior while gently moving harness to reproduce fault.
- If electrical supply/ground are good but signal is out of range or erratic, disconnect sensor and measure its output/resistance per factory procedure — replace sensor if out of spec.
- If sensor reads plausible but transmission behavior or pressure does not match, connect a mechanical transmission pressure gauge to the secondary pressure port and compare actual hydraulic pressure to sensor reading.
- If mechanical pressure is correct but sensor/TCM disagrees, suspect sensor or wiring; if mechanical pressure is incorrect, inspect valve body, solenoids and hydraulic circuits for blockage/leak.
- Check for TCM software updates or known technical service bulletins. If all wiring and sensor tests are good and issue persists, consider TCM fault (confirm with bench or swap tests if available).
- After repairs, clear codes and perform a road test while monitoring live data to confirm the fault is resolved.
Likely causes
- Open or short in sensor harness (connector corrosion or broken wire)
- Sensor electrical failure (out-of-range voltage or internal short)
- Contaminated hydraulic port at sensor or internal valve-body problem causing abnormal pressure
- Intermittent ground or supply from TCM causing implausible sensor voltage
Fault status
Status
Secondary pressure sensor circuit - implausible/invalid signal detected. Transmission control module has flagged the secondary pressure sensor circuit and may limit transmission operation until the condition is corrected.
Repair difficulty: Medium
Diagnostic time: 0.5–2.0 hours
Similar codes
Repair manuals
Brands with available manuals
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Code
P1704
SEAT
P — Powertrain
Kick-down switch - short to ground
Views:
UK: 18
EN: 37
RU: 22
AI status
Completed
Completed
100%
Causes
- Faulty secondary (line) pressure sensor
- Damaged, corroded or disconnected wiring/connector to the sensor
- Poor sensor ground or lost reference/5V supply from TCM
- Hydraulic issue (blocked/contaminated pressure port, internal valve body leak)
- Faulty TCM (rare) or software/calibration fault
- Incorrect transmission fluid level or severely degraded fluid affecting pressure readings
Symptoms
- MIL (Check Engine/Transmission warning) illuminated
- Harsh, delayed or erratic gear shifts
- Transmission slipping or failing to engage certain gears
- Vehicle may enter limp-home mode with limited gear selection
- Transmission-related fault messages displayed in cluster
- Unusual transmission noise or degraded driveability
What to check
- Read freeze frame and live data with a capable scan tool; note secondary pressure sensor values, related flags, and transmission temperature
- Visual inspection of sensor connector and wiring for corrosion, damage, pin push-out or fluid ingress
- Backprobe sensor connector and measure signal voltage with key ON / engine OFF and while running (observe change with throttle if safe)
- Verify reference supply (usually 5V) and ground integrity at the sensor connector
- Check for shorts to battery or ground using a multimeter and continuity tests
- If available, attach an external transmission pressure gauge to compare hydraulic pressure with sensor readings
Signal parameters
- Typical sensor output: ~0.5–4.5 V proportional to measured pressure (manufacturer-specific curve — consult Alfa Romeo spec)
- Reference supply: 5 V (approx.) from TCM; confirm stable 4.8–5.2 V at connector
- Ground: low resistance (
- Expected dynamic behavior: signal changes smoothly with throttle/gear changes; no rapid spikes or dropouts
- If using an absolute pressure scale: secondary/line pressure may typically range from 0–15 bar depending on gear and throttle (use factory spec for exact values)
Diagnostic algorithm
- Retrieve and record all related DTCs, freeze frame and live data (secondary pressure, primary pressure, transmission temp, speed sensors).
- Visually inspect the secondary pressure sensor, connector and harness for damage, fluid contamination or corrosion. Repair connector issues if found.
- With key ON engine OFF, backprobe the sensor connector: verify presence of reference voltage (≈5 V) and good ground. If absent, trace to TCM.
- Start engine and monitor sensor output voltage; observe whether signal varies smoothly with throttle and gear changes. Check for intermittent behavior while gently moving harness to reproduce fault.
- If electrical supply/ground are good but signal is out of range or erratic, disconnect sensor and measure its output/resistance per factory procedure — replace sensor if out of spec.
- If sensor reads plausible but transmission behavior or pressure does not match, connect a mechanical transmission pressure gauge to the secondary pressure port and compare actual hydraulic pressure to sensor reading.
- If mechanical pressure is correct but sensor/TCM disagrees, suspect sensor or wiring; if mechanical pressure is incorrect, inspect valve body, solenoids and hydraulic circuits for blockage/leak.
- Check for TCM software updates or known technical service bulletins. If all wiring and sensor tests are good and issue persists, consider TCM fault (confirm with bench or swap tests if available).
- After repairs, clear codes and perform a road test while monitoring live data to confirm the fault is resolved.
Likely causes
- Open or short in sensor harness (connector corrosion or broken wire)
- Sensor electrical failure (out-of-range voltage or internal short)
- Contaminated hydraulic port at sensor or internal valve-body problem causing abnormal pressure
- Intermittent ground or supply from TCM causing implausible sensor voltage
Fault status
Status
Secondary pressure sensor circuit - implausible/invalid signal detected. Transmission control module has flagged the secondary pressure sensor circuit and may limit transmission operation until the condition is corrected.
Repair difficulty: Medium
Diagnostic time: 0.5–2.0 hours
Similar codes
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Code
P1704
SUBARU
P — Powertrain
2-4 Brake Timing Solenoid Valve Circuit Malfunction
Views:
UK: 37
EN: 104
RU: 35
AI status
Completed
Completed
100%
Causes
- Faulty secondary (line) pressure sensor
- Damaged, corroded or disconnected wiring/connector to the sensor
- Poor sensor ground or lost reference/5V supply from TCM
- Hydraulic issue (blocked/contaminated pressure port, internal valve body leak)
- Faulty TCM (rare) or software/calibration fault
- Incorrect transmission fluid level or severely degraded fluid affecting pressure readings
Symptoms
- MIL (Check Engine/Transmission warning) illuminated
- Harsh, delayed or erratic gear shifts
- Transmission slipping or failing to engage certain gears
- Vehicle may enter limp-home mode with limited gear selection
- Transmission-related fault messages displayed in cluster
- Unusual transmission noise or degraded driveability
What to check
- Read freeze frame and live data with a capable scan tool; note secondary pressure sensor values, related flags, and transmission temperature
- Visual inspection of sensor connector and wiring for corrosion, damage, pin push-out or fluid ingress
- Backprobe sensor connector and measure signal voltage with key ON / engine OFF and while running (observe change with throttle if safe)
- Verify reference supply (usually 5V) and ground integrity at the sensor connector
- Check for shorts to battery or ground using a multimeter and continuity tests
- If available, attach an external transmission pressure gauge to compare hydraulic pressure with sensor readings
Signal parameters
- Typical sensor output: ~0.5–4.5 V proportional to measured pressure (manufacturer-specific curve — consult Alfa Romeo spec)
- Reference supply: 5 V (approx.) from TCM; confirm stable 4.8–5.2 V at connector
- Ground: low resistance (
- Expected dynamic behavior: signal changes smoothly with throttle/gear changes; no rapid spikes or dropouts
- If using an absolute pressure scale: secondary/line pressure may typically range from 0–15 bar depending on gear and throttle (use factory spec for exact values)
Diagnostic algorithm
- Retrieve and record all related DTCs, freeze frame and live data (secondary pressure, primary pressure, transmission temp, speed sensors).
- Visually inspect the secondary pressure sensor, connector and harness for damage, fluid contamination or corrosion. Repair connector issues if found.
- With key ON engine OFF, backprobe the sensor connector: verify presence of reference voltage (≈5 V) and good ground. If absent, trace to TCM.
- Start engine and monitor sensor output voltage; observe whether signal varies smoothly with throttle and gear changes. Check for intermittent behavior while gently moving harness to reproduce fault.
- If electrical supply/ground are good but signal is out of range or erratic, disconnect sensor and measure its output/resistance per factory procedure — replace sensor if out of spec.
- If sensor reads plausible but transmission behavior or pressure does not match, connect a mechanical transmission pressure gauge to the secondary pressure port and compare actual hydraulic pressure to sensor reading.
- If mechanical pressure is correct but sensor/TCM disagrees, suspect sensor or wiring; if mechanical pressure is incorrect, inspect valve body, solenoids and hydraulic circuits for blockage/leak.
- Check for TCM software updates or known technical service bulletins. If all wiring and sensor tests are good and issue persists, consider TCM fault (confirm with bench or swap tests if available).
- After repairs, clear codes and perform a road test while monitoring live data to confirm the fault is resolved.
Likely causes
- Open or short in sensor harness (connector corrosion or broken wire)
- Sensor electrical failure (out-of-range voltage or internal short)
- Contaminated hydraulic port at sensor or internal valve-body problem causing abnormal pressure
- Intermittent ground or supply from TCM causing implausible sensor voltage
Fault status
Status
Secondary pressure sensor circuit - implausible/invalid signal detected. Transmission control module has flagged the secondary pressure sensor circuit and may limit transmission operation until the condition is corrected.
Repair difficulty: Medium
Diagnostic time: 0.5–2.0 hours
Similar codes
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Code
P1704
VOLKSWAGEN
P — Powertrain
Kick Down Switch Malfunction
Views:
UK: 35
EN: 62
RU: 34
AI status
Completed
Completed
100%
Causes
- Faulty secondary (line) pressure sensor
- Damaged, corroded or disconnected wiring/connector to the sensor
- Poor sensor ground or lost reference/5V supply from TCM
- Hydraulic issue (blocked/contaminated pressure port, internal valve body leak)
- Faulty TCM (rare) or software/calibration fault
- Incorrect transmission fluid level or severely degraded fluid affecting pressure readings
Symptoms
- MIL (Check Engine/Transmission warning) illuminated
- Harsh, delayed or erratic gear shifts
- Transmission slipping or failing to engage certain gears
- Vehicle may enter limp-home mode with limited gear selection
- Transmission-related fault messages displayed in cluster
- Unusual transmission noise or degraded driveability
What to check
- Read freeze frame and live data with a capable scan tool; note secondary pressure sensor values, related flags, and transmission temperature
- Visual inspection of sensor connector and wiring for corrosion, damage, pin push-out or fluid ingress
- Backprobe sensor connector and measure signal voltage with key ON / engine OFF and while running (observe change with throttle if safe)
- Verify reference supply (usually 5V) and ground integrity at the sensor connector
- Check for shorts to battery or ground using a multimeter and continuity tests
- If available, attach an external transmission pressure gauge to compare hydraulic pressure with sensor readings
Signal parameters
- Typical sensor output: ~0.5–4.5 V proportional to measured pressure (manufacturer-specific curve — consult Alfa Romeo spec)
- Reference supply: 5 V (approx.) from TCM; confirm stable 4.8–5.2 V at connector
- Ground: low resistance (
- Expected dynamic behavior: signal changes smoothly with throttle/gear changes; no rapid spikes or dropouts
- If using an absolute pressure scale: secondary/line pressure may typically range from 0–15 bar depending on gear and throttle (use factory spec for exact values)
Diagnostic algorithm
- Retrieve and record all related DTCs, freeze frame and live data (secondary pressure, primary pressure, transmission temp, speed sensors).
- Visually inspect the secondary pressure sensor, connector and harness for damage, fluid contamination or corrosion. Repair connector issues if found.
- With key ON engine OFF, backprobe the sensor connector: verify presence of reference voltage (≈5 V) and good ground. If absent, trace to TCM.
- Start engine and monitor sensor output voltage; observe whether signal varies smoothly with throttle and gear changes. Check for intermittent behavior while gently moving harness to reproduce fault.
- If electrical supply/ground are good but signal is out of range or erratic, disconnect sensor and measure its output/resistance per factory procedure — replace sensor if out of spec.
- If sensor reads plausible but transmission behavior or pressure does not match, connect a mechanical transmission pressure gauge to the secondary pressure port and compare actual hydraulic pressure to sensor reading.
- If mechanical pressure is correct but sensor/TCM disagrees, suspect sensor or wiring; if mechanical pressure is incorrect, inspect valve body, solenoids and hydraulic circuits for blockage/leak.
- Check for TCM software updates or known technical service bulletins. If all wiring and sensor tests are good and issue persists, consider TCM fault (confirm with bench or swap tests if available).
- After repairs, clear codes and perform a road test while monitoring live data to confirm the fault is resolved.
Likely causes
- Open or short in sensor harness (connector corrosion or broken wire)
- Sensor electrical failure (out-of-range voltage or internal short)
- Contaminated hydraulic port at sensor or internal valve-body problem causing abnormal pressure
- Intermittent ground or supply from TCM causing implausible sensor voltage
Fault status
Status
Secondary pressure sensor circuit - implausible/invalid signal detected. Transmission control module has flagged the secondary pressure sensor circuit and may limit transmission operation until the condition is corrected.
Repair difficulty: Medium
Diagnostic time: 0.5–2.0 hours
Similar codes
Repair manuals
Manual library for VOLKSWAGEN
139
Browse 139 VOLKSWAGEN manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.
VOLKSWAGEN
-
VOLKSWAGEN: 2021
-
Atlas
- S, AWD
- S, FWD
- SE, 2.0L Eng VIN P, AWD
- SE, 2.0L Eng VIN P, FWD
- SE, 3.6L Eng VIN R, AWD
- SE, 3.6L Eng VIN R, FWD
- SEL, 2.0L Eng VIN P · 2.0L Eng VIN P2021: Atlas SEL
- SEL, 3.6L Eng VIN R, AWD
- SEL, 3.6L Eng VIN R, FWD
- SEL Premium, 2.0L Eng VIN P · 2.0L Eng VIN P2021: Atlas SEL Premium
- SEL Premium, 3.6L Eng VIN R · 3.6L Eng VIN R2021: Atlas SEL Premium
- SEL Premium R-Line
- SEL R-Line, AWD
- SEL R-Line, FWD
- SE R-Line, AWD
- SE R-Line, FWD
-
Atlas Cross Sport
- S, AWD
- S, FWD
- SE, 2.0L Eng VIN C, AWD
- SE, 2.0L Eng VIN C, FWD
- SE, 3.6L Eng VIN E, AWD
- SE, 3.6L Eng VIN E, FWD
- SEL, 2.0L Eng VIN C · 2.0L Eng VIN C2021: Atlas Cross Sport SEL
- SEL, 3.6L Eng VIN E, AWD
- SEL, 3.6L Eng VIN E, FWD
- SEL Premium, 2.0L Eng VIN C · 2.0L Eng VIN C2021: Atlas Cross Sport SEL Premium
- SEL Premium, 3.6L Eng VIN E · 3.6L Eng VIN E2021: Atlas Cross Sport SEL Premium
- SEL Premium R-Line
- SEL R-Line, AWD
- SEL R-Line, FWD
- SE R-Line, AWD
- SE R-Line, FWD
-
VOLKSWAGEN: 2020
-
Atlas
- S, 2.0L Eng VIN P · 2.0L Eng VIN P2020: Atlas S
- S, 3.6L Eng VIN R · 3.6L Eng VIN R2020: Atlas S
- SE, 2.0L Eng VIN P · 2.0L Eng VIN P2020: Atlas SE
- SE, 3.6L Eng VIN R, AWD
- SE, 3.6L Eng VIN R, FWD
- SEL, 2.0L Eng VIN P · 2.0L Eng VIN P2020: Atlas SEL
- SEL, 3.6L Eng VIN R, AWD
- SEL, 3.6L Eng VIN R, FWD
- SEL Premium
- SEL R-Line, AWD
- SEL R-Line, FWD
- SE R-Line, AWD
- SE R-Line, FWD
-
Atlas Cross Sport
- S, AWD
- S, FWD
- SE, 2.0L Eng VIN C, AWD
- SE, 2.0L Eng VIN C, FWD
- SE, 3.6L Eng VIN E, AWD
- SE, 3.6L Eng VIN E, FWD
- SEL, 2.0L Eng VIN C, AWD
- SEL, 2.0L Eng VIN C, FWD
- SEL, 3.6L Eng VIN E, AWD
- SEL, 3.6L Eng VIN E, FWD
- SEL Premium
- SEL Premium R-Line
- SEL R-Line, AWD
- SEL R-Line, FWD
- SE R-Line, AWD
- SE R-Line, FWD
-
Jetta
- GLI Autobahn, Automatic DCT Trans
- GLI Autobahn, Standard Trans
- GLI S, Automatic DCT Trans
- GLI S, Standard Trans
- R-Line, 1.4L Eng VIN 5, Automatic Trans
- R-Line, 1.4L Eng VIN 5, Standard Trans
- R-Line, 1.4L Eng VIN B · 1.4L Eng VIN B2020: Jetta R-Line
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