P0868: transmission fluid pressure low and the limp mode behind it
The gearbox measured its own pressure and found it insufficient. That is a protective code — it appears before the damage, not after it.
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P0882 and P0883: TCM power input signal low and high
The transmission module is reporting a supply problem. Every harsh shift and every limp mode that follows is a symptom, not a separate fault.
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P0894: transmission component slipping — measured, not guessed
The module compared what the gearbox should be doing with what it is doing, and named the difference. This is the code that precedes the expensive conversation.
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P1xxx codes: why your scanner says "manufacturer specific" and what to do
The same number means different things on different cars. That is not a limitation of your tool — it is how the standard was written, and there is a way around it.
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P2004 to P2010: intake manifold runner control stuck and circuit faults
Flaps inside the intake manifold change how air swirls into the cylinder. On a diesel they seize with carbon, and the failure has a mechanical worst case worth knowing.
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P2016 and P2017: intake manifold runner position sensor
The feedback half of the intake flap system. Without it the ECU is commanding flaps blind, and it will not do that for long.
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P204F: reductant system performance and the AdBlue you cannot ignore
The dosing system is not delivering what it should. Crystallised urea is the usual reason, and short journeys are the usual reason for that.
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P2031 to P2036: exhaust gas temperature sensor bank 1 sensor 2
A modern diesel carries several exhaust temperature sensors along its after-treatment system. Which one has failed determines what stops working.
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P2074: MAP/MAF and throttle position correlation
Three sensors that should agree about how much air is entering the engine. When they do not, the ECU cannot tell which one is lying — but you can.
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P2088 and P2089: camshaft actuator A circuit low and high
The electrical half of the variable valve timing system. Low or high circuit means a wiring problem — but the reason it failed is usually still the oil.
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P2098 and P2099: post-catalyst fuel trim bank 2 lean and rich
Bank 2 versions of a code that catches people out, because it is about a correction the ECU makes after the catalyst — not about the catalyst itself.
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P20EE: SCR NOx catalyst efficiency below threshold
The SCR system is not converting enough NOx. That has several possible causes, and only one of them is the catalyst itself.
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