P2767 No signal in the B speed sensor circuit at the input / speed of the turbine
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P2767 No signal in the B speed sensor circuit at the input / speed of the turbine
Home »Codes P2700-P2799» P2767
OBD-II DTC Datasheet
No signal in the sensor circuit "B" speed input / turbine
What does this mean?
This Diagnostic Trouble Code (DTC) is a generic transmission code, which means it applies to all vehicles since 1996 (Ford, Honda, Mazda, Mercedes, VW, etc.). Although general in nature, the specific repair steps may differ depending on the brand / model.
When I encounter DTC P2767, it is because the powertrain control module (PCM) has not detected the output voltage from the input (or turbine) speed sensor circuit that has been designated "B". Input shaft and turbine speed sensors are nearly identical in design and serve the same purpose, but manufacturers use different terms to describe them.
The inlet / turbine speed sensor is usually a three-wire electromagnetic sensor that is used to monitor the input speed of the transmission (defined by the PCM as RPM or RPM). The sensor is usually installed with a bolt / stud or screwed directly into the transmission case. It is usually located near the rear of the bell housing (on the transmission input shaft).
Specially designed grooves (or gear reaction wheel) are firmly attached to the main (or input) shaft of the transmission. When RPM is transmitted from the engine to the transmission, the input shaft (or reaction wheel) spins and passes in close proximity to the end of the sensor. A steel shaft (or reactor wheel) completes the electronic / electromagnetic circuit. The chain is interrupted when grooved (or notched) areas pass the sensor and an electronic pattern is formed. This patterning is accepted by the PCM as a waveform, which it is programmed to interpret as transmission power input / turbine speed.
To determine the desired input rpm, the transmission input speed / turbine speed is compared with the engine RPM, the engine load percentage and the transmission output speed. P2767 will be stored (and the malfunction lamp may illuminate) if the actual input / turbine speed or system circuit voltage does not match the desired input / turbine speed or manufacturer specified voltage.
symptoms
P2767 indicates a total loss of voltage in the input shaft / turbine speed sensor circuit. Symptoms of a P2767 code may include:
- Intermittent or erratic operation of the speedometer (odometer)
- Inability to change gears at all
- Inoperative speedometer and / or odometer
- Erratic or abrupt shift points
- Decreased fuel efficiency
reasons
Possible reasons for setting this code:
- A faulty input speed sensor B
- Damaged, loose, or shorted wiring and / or connectors in the circuit
- PCM error or PCM programming error
Diagnostic and repair procedures
A good starting point is always to check the Technical Service Bulletins (TSB) for your particular vehicle. Your problem may be a known issue with a known manufacturer-released fix and could save you time and money while troubleshooting.
A manufacturer's service manual, advanced diagnostic scanner, digital volt / ohmmeter (DVOM), and possibly an oscilloscope will be helpful in diagnosing the P2767 code.
Experienced technicians usually begin this diagnosis with a visual inspection of the system wiring and connectors. Shorted or open circuits and / or connectors must be repaired or replaced before proceeding. Inspect the battery, battery cables, and cable ends. Now I would check the power of the generator.
It's time to plug the scanner into the diagnostic port and retrieve all stored codes. Record them for future use and also record the freeze frame data.
If both input and output sensor codes are present, use the scanner data stream to determine which circuit is faulty. To get the most accurate data from your scanner, narrow your data stream to include only relevant information.
Excessive metal debris on the magnetic contacts of the input and / or output speed sensors can cause the sensor to malfunction. When removing the sensor, remove excess debris from the magnetic surfaces before reinstalling. When the sensors are removed, you will also want to check the jet wheel break grooves and / or notches for signs of damage or wear.
You can use the DVOM to test individual sensor resistance and circuit voltage. Follow the manufacturer's specifications (listed in the service manual or in the All Data section) and replace sensors that do not meet manufacturer's specifications.
Failure to disconnect associated controllers prior to testing resistance or continuity (using DVOM) may result in controller failure.
If a P2767 code persists and all system circuits and sensors are in proper working order and meet manufacturer's specifications, suspect a faulty PCM or a PCM programming error.
Additional diagnostic notes:
- If it is necessary to remove the input and / or output speed sensors from the transmission, use caution. Hot transmission fluid can leak out of the hole and burn your skin.
- Excessive metal debris (attracted to the electromagnetic sensor) can cause erroneous I / O speed sensor readings.
- Make sure the mounting surfaces / threaded holes are free of debris and obstructions as the gap between the sensor and the reactor is critical.
Related DTC discussions
- P2767 code 2007 Dodge Charger 5.7 with nag1The car has gone into a permanent sluggish mode... the code says it's the input shaft speed sensor.... Dealer says it's a conductive plate, gearbox plug.... Funny thing, it's a speed sensor, the conductive plate is the same part with a big difference in price, a completely different part number. … .Wtf never saw this… .I bought…
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