Mitsubishi Ssu P1629 Engine Trouble Code
What is Mitsubishi Ssu P1629?
With Mitsubishi Ssu P1629, you may drive for several weeks with a malfunctioning MAF sensor, but expect decreased fuel economy and eventual stalling. Shop replacement costs $240–$400 depending on vehicle. The labour is straightforward, with most cost from the part itself.
P1629 on the Mitsubishi Ssu
Mitsubishi Ssu models produced in the mid-cycle refresh years show a statistical uptick in P1629 occurrences linked to the variable valve timing (VVT) actuator. A sludge deposit in the oil galleries feeding the actuator is the leading suspect.
Code Information
| Code Type: | OBD-II Powertrain (P) Trouble Code |
| System: | Powertrain |
| Vehicle: | Mitsubishi Ssu |
| Brand: | Mitsubishi |
| Model: | Ssu |
| Code: | P1629 |
P1629 Mitsubishi Ssu Symptoms
Check Engine Light
Illuminated Mitsubishi Ssu dashboard warning
Engine Stalling
Engine stops unexpectedly or misfires
Performance Issues
Reduced power or acceleration on the Mitsubishi Ssu
Starting Problems
Difficulty starting the engine
Poor Fuel Economy
Increased fuel consumption on the Mitsubishi Ssu
Increased Emissions
Failed emissions test due to P1629
P1629 Code Structure
Understanding what each digit means in the P1629 powertrain trouble code:
| P | 1 | 6 | 2 | 9 |
|---|---|---|---|---|
| Powertrain Code | Fuel And Air Metering | Fuel Temperature Sensor B Circuit Range/Performance | Turbocharger Boost Sensor A Circuit Low | Reverse Input Circuit |
How to Fix Mitsubishi Ssu P1629
Diagnostic Steps:
Poor running symptoms align with MAP sensor malfunction. In some cases, a faulty MAP sensor will not trigger a code. The issue may represent separate wiring concerns requiring individual diagnosis.
Repair Solution:
VSS concerns may stem from noisy input signals caused by RFI/EMI from ignition wires, charging circuits, or aftermarket equipment. Verify VSS reads 0 mph when transmission is in Park.
Technical Notes:
P1629 DTC specifically relates to camshaft timing. When cam timing is over-retarded, the check-engine light illuminates and this code sets. Verify VCT solenoid operation and check for contamination.
Mitsubishi Ssu P1629 Repair Cost
Crankshaft reluctor ring inspection and replacement on the Mitsubishi Ssu is a major service item costing $600–$1,100. Given the labour required to access the component, it is advisable to replace the rear crankshaft seal and crankshaft position sensor simultaneously while the area is open.
P1629 Description
P1629 engine trouble code is related to Reverse Input Circuit.
Main Cause
The primary reason for P1629 OBD-II Engine Trouble Code is: Fuel Temperature Sensor B Circuit Range/Performance.
Common P1629 Misdiagnosis on the Mitsubishi Ssu
A frequent misdiagnosis on the Mitsubishi Ssu is replacing the oxygen sensor when P1629 appears, only for the code to return within days. The actual cause is usually an exhaust manifold gasket leak introducing false air before the upstream O2 sensor — a much cheaper fix.
DIY Repair Guide: P1629 on Mitsubishi Ssu
When attempting DIY diagnosis of P1629 on your Mitsubishi Ssu, a smoke machine test is the gold standard for finding vacuum leaks. Rental tools are available from most auto parts stores for $0–$20/day, or you can fabricate a makeshift tester using a hand vacuum pump and soapy water spray.
Preventing P1629 on the Mitsubishi Ssu
Scheduled inspection of the Mitsubishi Ssu air filter every 15,000 miles can prevent the intake restriction that leads to P1629. A blocked filter forces the engine to run rich, stressing the catalytic converter and ultimately storing fault codes.
Frequently Asked Questions — Mitsubishi Ssu P1629
A: If your Mitsubishi Ssu is within the factory powertrain warranty period (typically 3–5 years or 60,000–100,000 miles depending on region and generation), P1629 repairs caused by component defects should be covered. Bring your service history to the dealer appointment.