Q: I have codes and I need to know what I need to change.
I have the codes P0300- Random/multiple cylinder misfire detected P0687- control module power relay control circuit/ high P0686- control module power relay control circuit/ low.
I have changed the spark plugs withing the past few weeks. I checked the coils (which are fine) and there is no weird misfire vibrations. Should I change the ecu or the icm? How would I know which if not both to replace? Is it a hard job? How urgent is it to fix? I'm a delivery guy for a Chinese resteraunt so idk if I can drive it for work safely.
My car has 140000 miles.
My car has an automatic transmission.
The statements expressed above are only for informational purposes and should be independently verified. Please see our
terms of service
for more details
Get an instant quote for your car
Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing
What others are asking
How Does the Power Mirror Switch Work?
A conventional power mirror switch (https://www.yourmechanic.com/article/how-does-the-side-mirror-control-switch-work) is essentially two rocker switches built into a single housing. Each rocker switch is connected to two wires that are connected to a reversible DC (direct current) motor inside the rear view mirror on...
Step by step troubleshooting of DTC fault codes
Each of these codes are for different components and since you swapped the motor with a different size motor than what the car had may be a big problem. You would need to have each code diagnosed (https://www.yourmechanic.com/services/warning-light-is-on-inspection) separately to...
I can't get up to speed, the rpms ramp up, but the speedometer doesnt
This is a clutch that is slipping. Anytime your engine revs up and the vehicle does not increase speed the clutch is slipping. You may have a clutch disc that is worn. Otherwise there may be an oil leak (https://www.yourmechanic.com/services/oil-fluid-leak-inspection)...
Is it possible to install my broken serpentine belt back my car?
Hi, thanks for writing in. I'm a little confused by your question. If you're asking whether it's possible to install a broken serpentine belt (https://www.yourmechanic.com/article/how-to-replace-a-serpentine-belt-by-mia-bevacqua) on a vehicle and drive 20 miles, I'd say not. If the belt is physically...
trasmission
It sounds like one of the wheel sensors is not working properly and causing the vehicle to be in failure drive mode. You may have damaged one of the wheel speed sensors when replacing the bearings and brakes. Have the...
Car is not starting and overheating
Hi there. Usually if the engine starts to overheat it won't damage your cylinder heads unless excessive overheating has occurred. However, if the engine overheated, coolant that may have spilled over may have caused an ignition system issue that's preventing...
Why would my speedometer drop to 0 in my 2001 Hyundai Santa Fe
Hello. Typically when the speedometer just stops working like that it is due to a failure in the vehicle speed sensor. If the sensor is failing or if it is making a poor connection then the speedometer will act like...
Hi Peter. What is the cost to replace headlight assembly on 2011 Chrysler Town
Hi there. It is probably a good idea to have one of our professional mobile mechanics first come to your location and complete an onsite inspection (https://www.yourmechanic.com/services/headlight-is-not-working-inspection) to determine if this can be repaired or if replacement of the headlight...
Changed alternator and battery now car makes a noise when you start it up
This is a common sign of a loose or worn belt. This may have happened when you replaced the alternator potentially tightening the belt too tight. When this happens as you press the gas pedal and the belt goes from...
Related articles
Saab Certified Pre-Owned (CPO) Car Program
Many Many drivers who are in the market for a used Saab vehicle want to consider a Certified Pre-Owned, or CPO, vehicle. CPO programs allow owners of used cars to drive with confidence, knowing that their vehicle has been inspected...
How to Get Saab Dealership Certified
Saab car dealerships offer automotive technician jobs to mechanics who are Saab certified through the GM Service Technical College.
Understanding the Saab Oil Life System and Service Indicator Lights
Car symbols, or dashboard lights, are a car service reminder. The Saab Oil Life System (OLS) indicates when and what service your car needs.
Browse other content
Cities
Estimates