What is a TCC lockup solenoid?
A lockup solenoid is sometimes referred to as a torque converter clutch (TCC) solenoid, since it is essentially an electric valve that a transmission control unit (TCU), or engine control module (ECM), can use to directly control the torque converter.
What does a TCC brake switch do?
NOTES: This kit is necessary when using any GM overdrive transmission in an older vehicle. Allows for proper function of Torque Converter Lock-Up function.
How does a 700r4 torque converter lockup?
The TCC solenoid engages, locking up the converter. When the trans downshifts to Third gear, the pressure switch opens, interrupting flow through the relay to unlock the TCC solenoid. Alternatively, the driver can unlock the converter at any time by toggling the dash switch to the “Off” position.
What is code P0703?
A P0703 code means the PCM has registered a fault in the brake switch B circuit. This is the dedicated stop lamp circuit, which also deactivates the cruise control system and transmission torque converter lockup system, as well as the stop lamps.
What is a boo switch?
BOO = Brake On Off. Now I get to guess again. Hmmm BPP Brake Pedal Pressure ????????? switch. Now that would cause a no light situation.
How do I fix code P0703?
What Repairs Will Fix P0703?
- Replace or adjust the brake lamp switch.
- Replace brake light fuse.
- Replace fusible link.
- Replace brake light bulb(s)
- Replace brake light socket(s)
- Replace or repair shorted wiring or connectors.
- Reflash PCM/ECM.
What is a brake switch circuit?
Your brake light switch is a simple spring-loaded switch that is held open by a tab on the brake pedal, keeping the brake lights off. When you push the pedal down, the spring causes the switch to close, completing the electrical circuit and turning on the brake lights.
What does brake switch a circuit low mean?
Error Code P0572 is defined as Cruise Control/Brake Switch A Circuit Low, meaning there’s a malfunction detected within the cruise control system or brake switch of the vehicle, often caused by faulty or damaged wires. There are many factors that can alter the speed of the vehicle while driving down the road.
What happens if brake pedal switch is broken?
Brake light switch problems A faulty brake light switch can cause many problems. If a switch is bad, the brake lights won’t operate and the transmission shifter will not come out of “Park” position. In cars with a push-button start system, a faulty brake light switch can cause the vehicle not to start.