2019 Chevrolet Colorado Check Engine Light Diagnosis: P0019 and P0102 Codes with TPMS Problems
If you’ve ever looked at a used vehicle and thought, “The warning lights are probably no big deal,” this is exactly why you need to slow down and inspect things properly before making assumptions.
A 2019 Chevrolet Colorado crew cab recently came into the shop with a complaint involving warning lights on the dash. At first glance, it looked simple enough. The tire pressure warning light was illuminated, and the left front tire was nearly flat with severe run-flat damage. But once the scan tool came out, the truck also showed stored engine and body control module codes—even though the check engine light was no longer on.
This is where real-world automotive troubleshooting becomes important. Modern vehicles can store history codes from intermittent faults, low voltage events, and temporary system glitches. If you jump straight to replacing expensive parts without understanding the full picture, you can waste a lot of money very quickly.
🔧 Recommended Diagnostic Tools
When you're diagnosing modern vehicles, having the right tools makes all the difference. A basic code reader will only get you so far—you need tools that let you see what’s really going on and test components properly.
Autel MaxiSys MS906 Pro TS Scanner
This is an excellent professional-level scan tool for diagnosing car problems, reading manufacturer-specific data, viewing freeze-frame information, and performing TPMS relearns.
Power Probe 3 Circuit Tester
One of the fastest ways to test power, grounds, switches, and circuits without wasting time chasing wiring blindly.
Power Probe ECT3000 Short Finder
A huge time saver for finding shorts, parasitic drains, and hidden wiring problems inside modern vehicles.
Vehicle Overview
The vehicle involved was a 2019 Chevrolet Colorado crew cab equipped with the 3.6L engine. Mileage and overall condition were decent, but the truck had clearly been sitting for periods of time. That’s important because vehicles that sit frequently tend to develop battery-related issues, TPMS sensor failures, and intermittent electronic faults.
Vehicle Concern
The primary concern was the tire pressure warning light. The left front tire was almost completely flat and had visible run-flat damage. In situations like this, tire replacement is non-negotiable. Once a tire has been driven on with little to no air pressure, internal sidewall damage becomes a major safety concern.
During the inspection, a full system scan also revealed stored PCM and BCM trouble codes, even though the malfunction indicator lamp was not currently illuminated.
That immediately raises an important question during automotive troubleshooting:
Are these active failures, or are they history codes caused by temporary conditions?
Initial Inspection
The first step was verifying the obvious concern. The left front tire was severely underinflated, and the TPMS warning was active. Because of the tire damage, replacing two tires as a pair was recommended.
The battery and charging system were also tested early in the process. This is something many technicians skip, but it matters more than people realize when diagnosing modern vehicles.
Battery test results came back good, and alternator output was approximately 13.9 volts. That ruled out an active charging system problem.
Codes Found
The following PCM codes were stored:
P0019 — Crankshaft Position / Exhaust Camshaft Position Not Plausible Bank 2
P0102 — Mass Air Flow Sensor Circuit Low Frequency
The BCM also contained multiple TPMS-related codes:
C0750:03 — Left Front Tire Pressure Sensor Low Voltage
C0755:03 — Right Front Tire Pressure Sensor Low Voltage
C0760:03 — Left Rear Tire Pressure Sensor Low Voltage
Several additional history BCM codes were present as well, including parasitic load and switch circuit faults.
At first glance, the P0019 code can make people nervous because cam/crank correlation faults are sometimes associated with timing chain problems. But this is where freeze-frame data becomes critical.
Diagnostic Process
The freeze-frame information told the real story.
The P0019 fault occurred approximately 43 seconds after startup at only 9 mph with the engine still in open loop operation. Coolant temperature was only around 91 degrees Fahrenheit, indicating the engine was still warming up.
Fuel trims looked completely normal:
Short-term fuel trims were within acceptable range
Long-term fuel trims were stable
No drivability symptoms were present
Even more important, the ECM showed 53 ignition cycles without the fault returning.
That is a major clue.
A true mechanical timing issue usually does not disappear for dozens of ignition cycles without returning. Real timing chain problems tend to repeat consistently and often come with additional symptoms such as startup rattles, rough idle conditions, reduced performance, or active correlation failures.
The P0102 MAF code also appeared to be an intermittent startup-related event rather than an active sensor failure.
The truck had likely experienced low voltage conditions at some point from extended sitting or weak battery events during cranking. Low system voltage can create temporary sensor signal irregularities that trigger history codes without representing actual component failure.
This is extremely common in modern vehicles.
Key Findings
The active problem on this Colorado was the tire and TPMS system—not an engine timing failure.
The left front tire had run-flat damage and required replacement. Multiple TPMS sensors showed low voltage history faults, which strongly suggested aging sensor batteries. Since the truck was already due for tire service and the sensors were original, replacing all four TPMS sensors was the smartest long-term repair.
The PCM codes appeared to be intermittent history faults likely triggered during a startup or low-voltage event.
No current drivability issues were present, and no active check engine light remained illuminated.
Final Diagnosis
Final repairs included recommending two new tires along with replacement of all four TPMS sensors due to low-voltage history faults and sensor age.
The TPMS system would then require a relearn procedure after installation.
The battery and charging system tested normally, and no immediate evidence supported major engine timing repairs. All PCM and BCM codes were cleared, and the vehicle was advised to be monitored for any returning faults.
At this point, replacing timing chains or major engine components would have been premature and unnecessary.
Common Causes
This type of situation is incredibly common in modern vehicles, especially trucks that sit for extended periods.
Common causes include low battery voltage during startup, aging TPMS sensor batteries, intermittent startup-related sensor glitches, poor maintenance intervals, dirty oil affecting VVT operation, and vehicles sitting unused for long periods of time.
This is why proper diagnosing car problems requires looking at the entire picture instead of blindly replacing parts based solely on stored codes.
Lessons for Buyers / DIYers
One of the biggest mistakes people make during used car inspections is assuming that stored trouble codes automatically mean catastrophic repairs are needed.
Sometimes they do.
But many times, they simply point to intermittent events that need proper evaluation before making expensive decisions.
Always check freeze-frame data, battery condition, charging voltage, maintenance history, and whether the fault is current or only stored as history.
That information can save thousands of dollars in unnecessary repairs.
This is also why professional automotive troubleshooting matters. A code is only the starting point—not the final answer.
Don’t Get Burned on Your Next Used Car
If you’re thinking about buying a used car—or even if you already have one—this is exactly the kind of problem that can slip through the cracks and cost you big money later.
After 35+ years in the automotive field, I’ve seen firsthand how often people end up with vehicles that have hidden issues just like this.
That’s why I put together a simple Used Car Guide to help you understand what to look for and how to avoid making a costly mistake.
It’s a quick, practical guide designed to give you the right mindset and approach before you buy.
👉 https://stan.store/BobbyWhiteside
Disclaimer: Some links in this post may be affiliate links. I may earn a small commission at no extra cost to you. I only recommend tools I personally use and trust in real-world diagnostics.
Comments
Post a Comment