P0662 trouble code definition
A P0662 trouble code is related to a vehicle’s intake manifold tuning valve (IMTV) and the signal it sends to the engine computer. When that voltage is too high, a P0662 trouble code is triggered.
What the P0662 code means
P0662 is an OBD-II generic code for a voltage problem with the intake manifold tuning valve in that the signal being read by the engine computer is too high. The engine computer will typically monitor the valve for a failure test at start-up and if the internal test fails after a handful of restarts (the number depends on manufacturer), the code will be stored and a check engine light will illuminate.
What causes the P0662 code?
The most common cause is the faulty intake manifold tuning valve itself. Other causes could be faulty wiring to and from the valve, poor electrical connectors, or bad/dirty grounds.
What are the symptoms of the P0662 code?
P0662 codes will affect vehicles differently from a simple check engine light to poor acceleration and diminished economy.
How does a mechanic diagnose the P0662 code?
The way your mechanic deals with a P0662 will depend on how the code is impacting the driveability of the vehicle. If there are no adverse conditions, it might just be a matter of cleaning grounds, wiring and the intake manifold valve itself, clearing the code, and resetting the engine computer.
However, if the code is causing poor driving conditions, the valve may be faulty. Your mechanic will start by testing the signal sent from the valve to confirm it’s not within the manufacturer’s parameters. If confirmed, the valve will be replaced by a quality part.
Common mistakes when diagnosing the P0662 code
While it’s rare for the IMTV to not be the cause of a P0662, it isn’t impossible. It’s important to pay attention to any other trouble codes that accompany the P0662 as they could be the route cause of the issue. Testing the valve to confirm will also help isolate the problem instead of replacing something that was never bad to begin with.
How serious is the P0662 code?
Truth be told, a P0662 isn’t very serious but can cause irritating conditions if left unattended for too long. If your vehicle has a faulty IMTV, you could notice diminished performance and economy which is never a wanted characteristic from any vehicle.
What repairs can fix the P0662 code?
The most common repairs for a P0662 are as follows:
- Replacing the intake manifold tuning valve
- Replacing damaged wiring and electrical connections
- Cleaning the intake manifold tuning valve
Additional comments for consideration regarding the P0662 code
Intake manifold tuning valves are not equipped in every modern vehicle. They are prevalent in Hondas from the early 2000s, some Ford V8s such as the passenger car 4.6 liter, and early 90s Chevrolet Blazers with central multiport fuel injection (CMFI). Other names for the valve are intake manifold runner control valve as they operate in similar ways - separating the intake plenum to increase low-end torque at low rpms, and maximize air flow at high rpms.
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