Skip the auto shop - Our mechanics make house calls

Q: When it is cold outside. It will not start.Can you please help me?

asked by on

When it is cold outside my 1997 Chevy k1500 will not start. I had it on a code reader and it shows code P0420 and P 1351. I need help. I have replaced a lot of parts.

My car has 132567 miles.
My car has an automatic transmission.

Hello.

The codes listed are for issues with the emissions and ignition systems. Code P0420 indicates that the catalyst efficiency for bank 1 is below the specific threshold. That is, that the computer has detected that the catalytic converter is not reducing emissions properly. This can be caused by many things, most commonly faulty oxygen sensors or depleted catalytic converters. Code P1351 indicates that the computer has detected an excessively high voltage for the ignition circuit. This is likely related to your truck’s no start condition. A few possible causes for this are a faulty ignition relay, ignition switch, ignition module / coil, or a faulty ECM. I would start by testing the ignition system components one by one to see if any of them may be malfunctioning, before moving on to testing the computer for possible faults. Once this issue is cleared and the truck starts, then you can move on to solving the other trouble code.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. When it is cold outside. It will not start.Can you please help me?

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

Get a quote

What others are asking

Q: Fog light wiring

Hi there, it sounds like the wiring is rubbing on a ground somewhere causing excess power to surge through the circuit. Thankfully the fuse is there to protect the bulbs and wiring. One of our certified technicians would be able...

Q: Cylinder lock turns, but nothing happens

The ignition key cylinder turns a mechanism in the steering column normally. If this mechanism breaks, then the ignition key cylinder will not turn the ignition switch. The steering column covers will need to be removed to find the broken...

Q: Windows not going up or down

Hi there. Since multiple windows are not rolling up or down, this rules out the window motors. The parts that require attention are the window switch themselves. Your master switch or each individual window switch may not be working properly....

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...